TELEPORT COMMUNICATIONS GROUP INC
SC 13D, 1997-02-25
TELEPHONE COMMUNICATIONS (NO RADIOTELEPHONE)
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D
                    Under the Securities Exchange Act of 1934

                       TELEPORT COMMUNICATIONS GROUP INC.
                       ----------------------------------
                                (Name of Issuer)

                       CLASS A COMMON STOCK $.01 PAR VALUE
                       -----------------------------------
                         (Title of Class of Securities)

                                   879463 10 7
                                 (CUSIP Number)

                     John E. Jones, Secretary and Treasurer
                     General Atomic Technologies Corporation
                            3550 General Atomics Ct.
                           San Diego, California 92121
                                 (619) 455-2151

                                 With a copy to:

                            Arthur H. Fredston, Esq.
                       Winthrop, Stimson, Putnam & Roberts
                             One Battery Park Plaza
                          New York, New York 10004-1490
                                 (212) 858-1000


            --------------------------------------------------------
            (Name, Address and Telephone Number of Person Authorized
                     to Receive Notices and Communications)



                                February 4, 1997
                          -----------------------------
                          (Date of Event which Requires
                            Filing of this Statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
Schedule because of Rule 13d- 1(b)(3) or (4), check the following:  |_|

<PAGE>
                                  SCHEDULE 13D

- ----------------------------
                           |
CUSIP NO. 679463 107       |
                           |
- ----------------------------
- -------------------------------------------------------------------------------
         1.       NAME OF REPORTING PERSON
                  S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                                  General Atomics

- -------------------------------------------------------------------------------
         2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                         (a) |_|
                                                                         (b) |_|
- -------------------------------------------------------------------------------
         3.       SEC USE ONLY

- -------------------------------------------------------------------------------
         4.       SOURCE OF FUNDS
                                    OO
- -------------------------------------------------------------------------------
         5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
                  REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)   |_|
- -------------------------------------------------------------------------------
         6.       CITIZENSHIP OR PLACE OF ORGANIZATION
                  California
- --------------------------------------------------------------------------------
NUMBER OF                    7.   SOLE VOTING POWER
SHARES BENEFICIALLY                                    374,876
                                  ---------------------------------------------
OWNED BY
EACH REPORTING               8.   SHARED VOTING POWER
PERSON WITH                                            0
                                  ---------------------------------------------

                             9.   SOLE DISPOSITIVE POWER
                                                       374,876
                                  ----------------------------------------------

                             10.  SHARED DISPOSITIVE POWER
                                                       0
- -------------------------------------------------------------------------------
         11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
                  PERSON
                  374,876
- -------------------------------------------------------------------------------
         12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
                  CERTAIN SHARES |_|
- ------------------------------------------------------------------------------`
         13.      PERCENT OF CLASS REPRESENTED BY AMOUNT ON ROW (11)
                  1.3%
- -------------------------------------------------------------------------------
         14.      TYPE OF REPORTING PERSON
                                        CO

                                       -2-
<PAGE>
                                  SCHEDULE 13D

- ----------------------------
                           |
CUSIP NO. 679463 107       |
                           |
- ----------------------------
- -------------------------------------------------------------------------------
         1.       NAME OF REPORTING PERSON
                  S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                                  General Atomic Technologies Corporation

- -------------------------------------------------------------------------------
         2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                         (a) |_|
                                                                         (b) |_|
- -------------------------------------------------------------------------------
         3.       SEC USE ONLY

- -------------------------------------------------------------------------------
         4.       SOURCE OF FUNDS
                                  OO
- -------------------------------------------------------------------------------
         5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
                  REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)   |_|
- -------------------------------------------------------------------------------
         6.       CITIZENSHIP OR PLACE OF ORGANIZATION
                  Wyoming
- -------------------------------------------------------------------------------

NUMBER OF                    7.   SOLE VOTING POWER
SHARES BENEFICIALLY                                    1,997,716
                                  ---------------------------------------------
OWNED BY
EACH REPORTING               8.   SHARED VOTING POWER
PERSON WITH                                            0
                                  ---------------------------------------------

                             9.   SOLE DISPOSITIVE POWER
                                                       1,997,716
                                  ---------------------------------------------

                             10.  SHARED DISPOSITIVE POWER
                                                                      0
- -------------------------------------------------------------------------------
         11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
                  PERSON
                                  1,997,716
- -------------------------------------------------------------------------------
         12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
                  CERTAIN SHARES |_|
- -------------------------------------------------------------------------------
         13.      PERCENT OF CLASS REPRESENTED BY AMOUNT ON ROW (11)
                  6.7%
- -------------------------------------------------------------------------------
         14.      TYPE OF REPORTING PERSON
                                        CO

                                       -3-

<PAGE>
                                  SCHEDULE 13D

- ----------------------------
                           |
CUSIP NO. 679463 107       |
                           |
- ----------------------------
- -------------------------------------------------------------------------------
         1.       NAME OF REPORTING PERSON
                  S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                                  Tenaya Corporation

- -------------------------------------------------------------------------------
         2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                         (a) |_|
                                                                         (b) |_|
- -------------------------------------------------------------------------------
         3.       SEC USE ONLY

- -------------------------------------------------------------------------------
         4.       SOURCE OF FUNDS
                                   OO
- -------------------------------------------------------------------------------
         5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
                  REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)   o
- -------------------------------------------------------------------------------
         6.       CITIZENSHIP OR PLACE OF ORGANIZATION
                  Delaware
- -------------------------------------------------------------------------------
NUMBER OF                    7.   SOLE VOTING POWER
SHARES BENEFICIALLY                                    1,997,716
                                  ---------------------------------------------
OWNED BY
EACH REPORTING               8.   SHARED VOTING POWER
PERSON WITH                                            0
                                  ---------------------------------------------

                             9.   SOLE DISPOSITIVE POWER
                                                       1,997,716
                                  ---------------------------------------------

                             10.  SHARED DISPOSITIVE POWER
                                                       0

- -------------------------------------------------------------------------------
         11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
                  PERSON
                                  1,997,716
- -------------------------------------------------------------------------------
         12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
                  CERTAIN SHARES |_|
- -------------------------------------------------------------------------------
         13.      PERCENT OF CLASS REPRESENTED BY AMOUNT ON ROW (11)
                  6.7%
- -------------------------------------------------------------------------------
         14.      TYPE OF REPORTING PERSON
                                     CO

                                       -4-

<PAGE>
                                  SCHEDULE 13D

- ----------------------------
                           |
CUSIP NO. 679463 107       |
                           |
- ----------------------------
- -------------------------------------------------------------------------------
         1.       NAME OF REPORTING PERSON
                  S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                                  James N. Blue

- -------------------------------------------------------------------------------
         2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                         (a) |_|
                                                                         (b) |_|
- -------------------------------------------------------------------------------
         3.       SEC USE ONLY

- -------------------------------------------------------------------------------
         4.       SOURCE OF FUNDS
                                   OO
- -------------------------------------------------------------------------------
         5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
                  REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)   o
- -------------------------------------------------------------------------------
         6.       CITIZENSHIP OR PLACE OF ORGANIZATION
                  U.S.
- -------------------------------------------------------------------------------
NUMBER OF                   7.   SOLE VOTING POWER
SHARES BENEFICIALLY                                   1,997,716
                                 ----------------------------------------------
OWNED BY
EACH REPORTING              8.   SHARED VOTING POWER
PERSON WITH                                           0
                                 ----------------------------------------------

                            9.   SOLE DISPOSITIVE POWER
                                                      1,997,716
                                 ----------------------------------------------

                            10.  SHARED DISPOSITIVE POWER
                                                      0
- -------------------------------------------------------------------------------
         11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
                  PERSON
                                  1,997,716
- -------------------------------------------------------------------------------
         12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
                  CERTAIN SHARES |_|
- ------------------------------------------------------------------------------`
         13.      PERCENT OF CLASS REPRESENTED BY AMOUNT ON ROW (11)
                  6.7%
- -------------------------------------------------------------------------------
         14.      TYPE OF REPORTING PERSON
                                       IN

                                       -5-

<PAGE>

                                  SCHEDULE 13D


     The summary descriptions  contained in this statement of certain agreements
and documents are qualified in their entirety by reference to the complete texts
of such agreements and documents filed as Exhibits hereto,  which agreements and
documents are hereby incorporated herein by reference.


Item 1. Security and Issuer

     This  statement  relates  to the Class A Common  Stock,  $.01 par value per
share (the  "Company  Common  Stock") of Teleport  Communications  Group Inc., a
Delaware  corporation (the "Company").  The principal  executive  offices of the
Company are located at 429 Ridge Road, Dayton, New Jersey 08810.


Item 2. Identity and Background

     This  statement is being filed by the following  persons (each a "Reporting
Person" and  collectively  the  "Reporting  Persons"):  (i) General  Atomics,  a
California corporation ("GA"), (ii) General Atomic Technologies  Corporation,  a
Wyoming corporation ("GATC"),  (iii) Tenaya Corporation,  a Delaware corporation
("Tenaya") and (iv) James N. Blue, an individual.

     The Reporting Persons have entered into a Joint Filing Agreement,  dated as
of February 12, 1997, which relates to this statement  (including any amendments
hereto), a copy of which is attached as Exhibit A hereto.

     GA is a privately-owned  corporation principally engaged in the business of
government  contracting.  The principal  business  address of GA is 3550 General
Atomics Ct., San Diego, California 92121.

     GATC is a  privately-owned  holding company for  diversified  businesses in
technology and other  industries.  GATC holds all of the issued and  outstanding
common  stock of GA. The  principal  business  address  of GATC is 3550  General
Atomics Ct., San Diego, California 92121.

     Tenaya is a privately-owned  holding company for diversified  businesses in
technology  and  other  industries.  Tenaya  owns  common  stock  of GATC  which
represents  80% of the aggregate  voting power of the capital stock of GATC. The
principal business address of Tenaya is P.O. Box 910304,  San Diego,  California
92191-0304.

     Mr. Blue's principal occupation is chairman,  director, president and chief
executive officer of GA. Mr. Blue owns shares of preferred stock of Tenaya which
represent  approximately  61% of the aggregate voting power of the capital stock
of Tenaya.  Mr. Blue's business  address is 3550 General Atomics Ct., San Diego,
California 92121.


                                       -6-

<PAGE>



     The name, business address,  present principal occupation and employment of
each  executive  officer and  director  of GA,  GATC and Tenaya (the  "Executive
Officers  and  Directors")  are  set  forth  in  Schedule  I  hereto,  which  is
incorporated herein by reference.

     During the last five years,  none of the Reporting Persons and, to the best
knowledge of each Reporting Person, none of the Executive Officers and Directors
has (A) been convicted in a criminal proceeding (excluding traffic violations or
similar misdemeanors) or (B) been a party to a civil proceeding of a judicial or
administrative body of competent jurisdiction and as a result of such proceeding
was or is  subject  to a  judgment,  decree  or  final  order  enjoining  future
violations  of, or prohibiting  or mandating  activities  subject to, federal or
state securities laws or finding any violation with respect to such laws.

     Each of the  individuals  listed in this Item 2 or  Schedule  I hereto is a
citizen of the United  States of  America,  except  that Anne P. Blue and Walter
Simon are citizens of Germany.

Item 3. Source and Amount of Funds or Other Consideration

     All of the shares of Company  Common Stock owned by the  Reporting  Persons
were acquired on February 4, 1997,  pursuant to an Agreement and Plan of Merger,
dated as of January 13, 1997 (the "Merger Agreement"),  by and between GA, GATC,
CERFnet Services, Inc., a Delaware corporation ("CERFnet"), the Company and CNSI
Acquisition  Corp.,  a  Delaware  corporation  ("Sub").  Pursuant  to the Merger
Agreement,  CNSI (a wholly-owned  subsidiary of the Company) was merged with and
into CERFnet (the  "Merger")  and the issued and  outstanding  shares of CERFnet
common stock were  converted into the right to receive an aggregate of 2,100,000
shares of  Company  Common  Stock.  Immediately  prior to the  consummation  the
Merger,  GA and GATC held in the aggregate  approximately 95% of the outstanding
common  stock  of  CERFnet.  As  a  result  of  the  Merger,  CERFnet  became  a
wholly-owned subsidiary of the Company.

     In  addition,  pursuant to the Merger  Agreement,  GA and GATC entered into
certain non-compete agreements, which are described in Item 6 below.

     The  description of the Merger  Agreement set forth herein does not purport
to be complete and is qualified in its entirety by its provisions.


Item 4. Purpose of Transaction.

     The shares of Company Common Stock were acquired for  investment  purposes.
None of the Reporting  Persons has any  intention of acquiring  control over the
Company;  however,  depending  upon  market  and  other  conditions,  any of the
Reporting  Persons may acquire  additional  shares of Company  Common  Stock for
investment purposes if such shares become available at prices

                                       -7-

<PAGE>



that are  attractive  to them,  or may dispose of all or a portion of the shares
that they currently own or may hereinafter  acquire.  Except as disclosed above,
the  Reporting  Persons do not have any plans or proposals of the type set forth
in Paragraphs (a) through (j) of Item 4 of Schedule 13D.


Item 5. Interest in Securities of the Issuer.

     (a) As of the close of business on February 4, 1997:

               (i) GA owns 374,876 shares of Company Common Stock,  constituting
               approximately  1.3% of the  outstanding  shares of Company Common
               Stock.

               (ii) GATC owns  1,622,840  shares of Company  Common Stock and is
               deemed to  beneficially  own the shares of Company  Common  Stock
               held by GA (which is its wholly-owned  subsidiary),  constituting
               in the aggregate approximately 6.7% of the issued and outstanding
               shares of Company Common Stock.

               (iii) By virtue of the  relationships  reported  under  Item 2 of
               this  statement,  each of Tenaya and Mr. Blue may be deemed to be
               the beneficial owner of 1,997,716 shares of Company Common Stock,
               constituting  approximately  6.7% of the  outstanding  shares  of
               Company Common Stock.

     (b) GA has  sole  power to vote or to  direct  the  vote of all  shares  of
Company  Common  Stock  referred  to in  paragraph  (i) above and sole  power to
dispose or to direct the disposition of all such shares.  GATC has sole power to
vote or to direct the vote of all shares of Company  Common Stock referred to in
paragraph  (ii)  above as owned by it and is  deemed  to have  such  power  with
respect  to the  shares  referenced  in  paragraph  (i)  above by  virtue of its
ownership of all of the issued and outstanding common stock of GA. Tenaya may be
deemed to have the same  power to  direct  the vote and the  disposition  of the
shares  of  Company  Common  Stock  beneficially  owned by GATC by virtue of its
ownership of common stock of GATC which  represents 80% of the aggregate  voting
power of the  capital  stock of GATC.  Mr.  Blue may be  deemed to have the same
power to direct the vote and the  disposition  of the  shares of Company  Common
Stock  beneficially  owned by Tenaya by virtue of his ownership of approximately
61% of the issued and outstanding common stock thereof.

     (c) Except as  described in Item 3, none of the  Reporting  Persons and, to
the best knowledge of each Reporting Person, no Executive Officer,  has effected
any transactions in shares of Company Common Stock during the past 60 days.

     (d) Not applicable.

     (e) Not applicable.



                                       -8-

<PAGE>



Item 6. Contracts, Arrangements, Understandings or
        Relationships With Respect to Securities of the Issuer.

     Pursuant  to the  Merger  Agreement,  GA and GATC have  agreed  to  certain
noncompete   provisions  with  respect  to  such  Reporting  Persons  and  their
affiliates, as more fully described in the Merger Agreement.

     Pursuant to a Registration  Rights  Agreement  dated as of February 4, 1997
(the "Registration Rights Agreement"),  the Company has granted GA, GATC and the
other former CERFnet  stockholders  certain piggyback  registration  rights with
respect  to the shares of Company  Common  Stock  received  in the  Merger.  The
Registration Rights Agreement also contains certain lockup provisions applicable
in the case of certain registered offerings by the Company.


Item 7.  Material to be Filed as Exhibits.

         Exhibit A - Joint Filing Agreement

         Exhibit B - Agreement and Plan of Merger, dated as of
                     January 13, 1997, by and among GATC, GA,
                     CERFnet, the Company and Sub.

         Exhibit C - Registration Rights Agreement, dated as of
                     February 4, 1997, by and among GATC, GA, Neal
                     Karsten Blue, Pushpendra Mohta and the
                     Company.



                                       -9-

<PAGE>




     After  reasonable  inquiry  and to the best  knowledge  and  belief  of the
undersigned,  the  undersigned  certifies that the information set forth in this
Statement is true, complete and correct.


DATED:  February 13, 1997

                         GENERAL ATOMICS



                         By:   /s/ James N. Blue
                            ---------------------------
                            Name:  James N. Blue
                            Title: Director, Chariman,
                                       President and CEO


                         GENERAL ATOMIC TECHNOLOGIES
                                  CORPORATION



                         By:  /s/ James N. Blue
                            ---------------------------
                            Name:  James N. Blue
                            Title: Director, Chairman and
                                       President

                         TENAYA CORPORATION



                         By: /s/ James N. Blue
                            ---------------------------
                            Name:  James N. Blue
                            Title: Chairman, Director and
                                       President


                          /s/ James N. Blue
                          -----------------------------
                              James N. Blue


                                                      -10-


<PAGE>



                                   SCHEDULE I

                       Executive Officers and Directors of
                                 General Atomics

         Except where otherwise  indicated,  the business address of each of the
following  is General  Atomics,  3550  General  Atomics  Court,  San  Diego,  CA
92121-1194.


Name and                         Principal Occupation
Position                         and Business Address
- --------                         --------------------

Harold Agnew                     Retired - Consultant
Director                         322 Punta Baja Drive
                                 Solana Beach, CA  92075

James N. Blue,                   Director, Chairman, President and
Chairman, Director,              CEO of GA
President and CEO

Linden S. Blue,                  Director, Vice Chairman and Sr.
Director, Vice Chairman          Vice President of GA
and Sr. Vice President

John E. Jones                    Director and Sr. Vice President
Director and                     of GA
Sr. Vice President

Max D. Kemp                      Sr. Vice President and Chief
Sr. Vice President and           Financial Officer of GA
Chief Financial Officer

David A. Goldberg                Self-employed consultant
Director                         750 Park Avenue
                                 New York, New York  10021

William R. Gould                 Chairman of the Board (Emeritus)
Director                         Southern California Edison
                                 100 Long Beach Boulevard, #716
                                 Long Beach, CA  90901

Robert Hunter                    Chairman of the Board
Director                         Litel Instruments
                                 8655 Production Avenue, Suite B
                                 San Diego, CA  92121

G. A. Keyworth, II               Consultant and President of the
Director                         Keyworth Company
                                 41 Avenida de las Casas
                                 Casas de San Juan
                                 Santa Fe, NM  87501

John W. Vessey                   Retired General, U.S. Army
Director                         HCR-1, Box 136A
                                 Garrison, MN  56450

                                      -11-


<PAGE>



                       Executive Officers and Directors of
                     General Atomic Technologies Corporation


         Except where otherwise  indicated,  the business address of each of the
following  is General  Atomics,  3550  General  Atomics  Court,  San  Diego,  CA
92121-1194.


Name and                        Principal Occupation
Position                        and Business Address
- --------                        --------------------

James N. Blue,                  Director, Chairman, President
Director, Chairman              and CEO of GA
and President

Linden S. Blue,                 Director, Vice Chairman and
Vice President                  Sr. Vice President of GA

John E. Jones,                  Director and Sr. Vice President
Secretary and                   of GA
Treasurer

David A. Goldberg,              Self-employed consultant
Director                        750 Park Avenue
                                New York, New York  10021

Jerry M. Jones,                 CPA
Director                        8545 Avenida de las Ondas
                                La Jolla, CA  92037


                                      -12-


<PAGE>



                       Executive Officers and Directors of
                               Tenaya Corporation


         Except where otherwise  indicated,  the business address of each of the
following  is General  Atomics,  3550  General  Atomics  Court,  San  Diego,  CA
92121-1194.


Name and                         Principal Occupation
Position                         and Business Address
- --------                         --------------------

James N. Blue,                   Chairman, Director, President and
Director, Chairman,              CEO of GA
and President

Anne P. Blue,                    Director of Community Affairs of GA
Director and
Vice President

John E. Jones,                   Director and Sr. Vice President
Secretary and                    of GA
Treasurer


                                      -13-

<PAGE>




                                    EXHIBITS


         Exhibit A -  Joint Filing Agreement

         Exhibit B -  Agreement and Plan of Merger, dated as of
                      January 13, 1997, by and among GATC, GA,
                      CERFnet, the Company and Sub.

         Exhibit C -  Registration Rights Agreement, dated as of
                      February 4, 1997, by and among GATC, GA, Neal
                      Karsten Blue, Pushpendra Mohta and the
                      Company.



                                      -14-


<PAGE>

                                                                      Exhibit A





                             JOINT FILING AGREEMENT


     In accordance with Rule 13d-1(f) under the Securities Exchange Act of 1934,
as amended, each of the persons named below agrees to the joint filing on behalf
of each of them of a Statement on Schedule 13D  (including  amendments  thereto)
with respect to the shares of Class A Common Stock, $.01 par value per share, of
Teleport  Communications Group Inc., a Delaware corporation,  and further agrees
that this Joint  Filing  Agreement  be  included  as an  exhibit to such  filing
provided that, as  contemplated by Section  13d-1(f)(l)(ii),  no person shall be
responsible for the  completeness or accuracy of the information  concerning the
other  persons  making the filing,  unless  such  person  knows or has reason to
believe that such  information is inaccurate.  This Agreement may be executed in
any number of counterparts, all of which taken together shall constitute one and
the same instrument.

Dated: February 13, 1997


                                GENERAL ATOMIC
                                  TECHNOLOGIES CORPORATION


                                By:   /s/ James N. Blue
                                   -----------------------------
                                   Name:  James N. Blue
                                   Title: Director, Chairman and
                                                  President

                                GENERAL ATOMICS


                                By:   /s/ James N. Blue
                                   -----------------------------
                                   Name:  James N. Blue
                                   Title: Director, Chairman,
                                                  President and CEO

                                TENAYA CORPORATION


                                By:   /s/ James N. Blue
                                   -----------------------------
                                   Name:  James N. Blue
                                   Title: Chairman, Director and
                                                  President


                                   /s/ James N. Blue
                                   -----------------------------
                                       James N. Blue

                                      -15-


<PAGE>
                                                                      EXHIBIT B
                          AGREEMENT AND PLAN OF MERGER

         THIS  AGREEMENT  AND PLAN OF MERGER (this  "Agreement")  is dated as of
January 13,  1997,  by and among  GENERAL  ATOMIC  TECHNOLOGIES  CORPORATION,  a
Wyoming corporation  ("GATC"),  GENERAL ATOMICS, a California  corporation ("GA"
and,  collectively with GATC, the  "Stockholders"),  CERFNET  SERVICES,  INC., a
Delaware  corporation (the  "Company"),  TELEPORT  COMMUNICATIONS  GROUP INC., a
Delaware corporation ("TCGI") and CNSI ACQUISITION CORP., a Delaware corporation
("Sub").


                                    RECITALS

         WHEREAS,  the  Stockholders  are the  owners of all of the  issued  and
outstanding capital stock of the Company; and

         WHEREAS, each of Sub and the Company have determined it to be advisable
for business  reasons and in the best interests of said  corporations  and their
respective  stockholders that Sub be merged with and into the Company,  pursuant
to Section 251 of the Delaware  General  Corporation Law ("Delaware  Law"),  and
pursuant to the terms and  conditions  set forth herein,  with the Company being
the surviving corporation of such merger;

                                   AGREEMENTS

         NOW THEREFORE, in consideration of the above recitals and of the mutual
agreements  and  covenants  contained  in this  Agreement,  the  parties to this
Agreement, intending to be legally bound, agree as follows:

SECTION 1                  DEFINITIONS

         1.1  Certain  Definitions.   The  following  terms,  as  used  in  this
Agreement, shall have the meanings set forth in this Section:

         "Affiliate"  means,  with  respect to any Person,  any other  Person or
entity that, directly or indirectly, through one or more intermediates controls,
is controlled by or is under common control with the first specified Person.

         "Booked Taxes" has the meaning assigned to it in Section 6.5(a).

         "CERCLA" means the Comprehensive Environmental Response Compensation 
Liability Act, as amended by the Superfund Amendments and Reauthorization Act,





<PAGE>



42 U.S.C. ss. 9601, et seq.

         "Certificate of Merger" has the meaning assigned to it in Section 2.3.

         "Certificates" has the meaning assigned to it in Section 2.10.

         "CERFnet Germany" means CERFnet Germany, Inc., a Delaware corporation.

         "CERFnet  Germany  Dividend" has the meaning  assigned to it in Section
6.9(a).

         "CERFnet  Germany  Transactions"  has  the  meaning  assigned  to it in
Section 6.9(a).

         "Closing"  means  the  consummation  of the  Merger  pursuant  to  this
Agreement, in accordance with the provisions of Section 2.

         "Closing  Date"  means  the  date  on  which  the  Closing  occurs,  as
determined pursuant to Section 2.

         "Code" means the Internal  Revenue  Code of 1986,  as amended,  and the
rules and regulations promulgated thereunder.

         "Collection Period" has the meaning given to it in Section 6.10(b).

         "Company  Charter  Amendment"  means  the  amendment  to the  Company's
Certificate of  Incorporation  filed with the Secretary of State of the State of
Delaware on January 7, 1997.

         "Company  Common  Stock"  means the common  stock,  $1.00 par value per
share, of the Company.

         "Company Preferred Stock" means the preferred stock,  $10,000 par value
per share, of the Company.

         "Company  Shares"  means all shares of Company  Common Stock issued and
outstanding immediately prior to the Effective Time.

         "Company Transaction" has the meaning assigned to it in Section 6.7.

         "Compensation  Arrangement" means any plan or compensation  arrangement
other  than an  Employee  Benefit  Plan,  whether  written or  unwritten,  which
provides to employees, former employees,  officers, directors or shareholders of
the Company or any ERISA Affiliate any  compensation or other benefits,  whether
deferred  or not, in excess of base salary or wages  (excluding  overtime  pay),
including, but not limited to, any bonus or incentive plan, stock rights plan,





<PAGE>



employee  stock  ownership  plan,  deferred   compensation   arrangement,   life
insurance,  stock purchase plan,  severance pay plan,  golden  parachute and any
other perquisites and employee fringe benefit plan.

         "Confidentiality  Agreement"  means that  certain  Joint  Nondisclosure
Agreement,  effective as of July 22, 1996,  by and between TCGI and  Hambrecht &
Quist, as Agent for the Company.

         "Consents"  means the  consents,  permits or  approvals  of  government
authorities and other third parties necessary to convert the Company Shares into
TCGI Common Stock or otherwise to consummate the  transactions  contemplated  by
this Agreement.

         "Contracts" means all contracts, leases,  non-governmental licenses and
other agreements  (including leases for personal or real property and employment
agreements,   but  not  including   Employee   Benefit  Plans  and  Compensation
Arrangements), written or oral (including any amendments and other modifications
thereto),  (a) which are binding upon the Company and which relate  primarily to
or  primarily  affect the  business or  operations  of the Company or any of its
properties  or (b) to which the  Company  is a party,  and,  in the case of both
clauses (a) and (b),  (i) which are in effect on the date of this  Agreement  or
(ii) which are entered  into by the Company  between the date of this  Agreement
and the Closing Date in accordance with the terms hereof.

         "Delaware Law" has the meaning assigned to it in the recitals hereof.

         "Disclosure  Schedules"  means,  collectively,  the Schedules  attached
hereto and delivered hereunder.

         "DOJ" has the meaning assigned to it in Section 6.4(b).

         "Effective Time" has the meaning assigned to it in Section 2.3.

         "Employee Benefit Plan" means any plan,  program or arrangement that is
or was an  "employee  benefit  plan" as such term is defined in Section  3(3) of
ERISA and  which (i)  within  the past six  years (a) was or is  established  or
maintained  by the Company or any ERISA  Affiliate  or (b) either the Company or
any ERISA Affiliate  contributed to or was obligated to contribute to or to fund
or provide benefits; or (ii) provides or promises benefits to any natural Person
who  performs  or who has  performed  services  for  the  Company  or any  ERISA
Affiliate and because of those services is or has been (x) a participant therein
or (y) entitled to benefits thereunder.

         "Environmental Laws" means any applicable order, judgment, injunction,





<PAGE>



award,  decree  or  writ  or  any  applicable  law,  statute,  code,  ordinance,
regulation  or other  requirement  of any  government  or political  subdivision
thereof,  whether federal,  state, local or foreign,  or any agency,  regulatory
authority or instrumentality of any such government or political subdivision, or
any court or arbitrator  relating to pollution or  protection of health,  public
welfare or the environment,  including,  without limitation,  Environmental Laws
relating to the manufacture,  processing, distribution, use, treatment, storage,
disposal, transport or handling of Hazardous Materials.

         "ERISA" means the Employee  Retirement  Income Security Act of 1974, as
amended, and the rules and regulations promulgated thereunder.

         "ERISA   Affiliate"   means   any   corporation,    partnership,   sole
proprietorship  or other  entity  related to the  Company  within the meaning of
Sections 414(b), (c), (m) or (o) of the Code.

         "Financial Statements" has the meaning assigned to it in Section 3.7.

         "FTC" has the meaning assigned to it in Section 6.4(b).

         "GA  Affiliated  Group"  has  the  meaning  assigned  to it in  Section
3.17(c).

         "Hazardous  Materials"  means (1)  hazardous  materials,  contaminants,
constituents,  hazardous  wastes and  hazardous  substances  as those  terms are
defined  in the  following  statutes  and  their  implementing  regulations,  as
amended: the Hazardous Materials Transportation Act, 49 U.S.C. ss. 1801 et seq.,
the Resource  Conservation and Recovery Act, 42 U.S.C. ss. 6901 et seq., CERCLA,
the Clean Water Act, 33 U.S.C. ss. 1251 et seq., and the Toxic Substance Control
Act, 15 U.S.C.  ss. 2601 et seq.,  (2)  petroleum,  including  crude oil and any
fractions thereof,  (3) natural gas, synthetic gas and any mixtures thereof, (4)
asbestos  and/or  asbestos-containing  materials,  (5) PCBs,  or  PCB-containing
materials or fluids, (6) any other substances with respect to which any federal,
state or local  agency or other  governmental  authority  may require  either an
environmental  investigation  or  environmental  remediation,  and (7) any other
hazardous  or noxious  substance,  material,  pollutant or solid or liquid waste
that is regulated by any Environmental Laws.

         "HSR Act" means the  Hart-Scott-Rodino  Antitrust  Improvements  Act of
1976, as amended, and the rules and regulations promulgated thereunder.

         "Incentive   Agreements"   means,   collectively,   (i)  the  Incentive
Agreement, dated as of January 10, 1997, between the Stockholders and Pushpendra





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Mohta and (ii) the Incentive Agreement,  dated as of January 10, 1997, between 
the Stockholders and Neal Karsten Blue.

         "Incentive Loan Arrangements" means the loans between GA and Pushpendra
Mohta  and Neal  Karsten  Blue for their pro rata  share of  withholding  taxes,
related to their  receipt of Company  Common  Stock  pursuant  to the  Incentive
Agreements.

         "Indemnifiable  Tax Damages" has the meaning  assigned to it in Section
6.5(b).

         "Indemnified Party" has the meaning assigned to it in Section 10.4.

         "Indemnifying Party" has the meaning assigned to it in Section 10.4.

         "Instructions" has the meaning assigned to it in Section 2.8(a).

         "Intangibles" means all copyrights,  trademarks,  trade names,  service
marks,  service names,  licenses,  patents,  permits,  proprietary  information,
technical  information and data, computer programs and program rights,  software
and databases and other similar  intangible  property  rights and interests (and
any goodwill  associated  with any of the foregoing)  applied for, issued to, or
owned by the Company or under which the  Company is licensed or  franchised  and
which are used or useful  in the  business  of the  Company,  together  with any
additions thereto between the date of this Agreement and the Closing Date.

         "Lien"  as  applied  to the  property  of any  Person  means:  (a)  any
mortgage,   lien,  pledge,  charge,  lease  constituting  a  capitalized  lease,
conditional  sale or other title retention  agreement,  claims,  option or other
security  interest or encumbrance of any kind in respect of any property of such
Person,  or upon the income or profits  therefrom;  (b) any  arrangement,  under
which any  property  of such Person is  transferred,  sequestered  or  otherwise
identified for the purpose of subjecting the same to the payment of indebtedness
in priority to the payment of the general,  unsecured  creditors of such Person;
(c) the filing of, or any agreement to give, any financing  statement  under the
Uniform  Commercial  Code or its  equivalent of any  jurisdiction  in respect of
indebtedness;  and (d) in the case of securities or other equity interests,  any
purchase  option,  call or similar  right of a third party with  respect to such
securities or other equity interests.

         "Losses" has the meaning assigned to it in Section 10.2.






<PAGE>



         "Material  Adverse  Effect" means any materially  adverse change in, or
materially  adverse  effect on, the  business,  assets,  results of  operations,
financial condition or prospects of the Company.

         "Material Contract" has the meaning assigned to it in Section 3.12.

         "Merger" has the meaning assigned to it in Section 2.1.

         "Merger Consideration" has the meaning assigned to it in Section 2.8.

         "Multiemployer  Plan"  means  any  Employee  Benefit  Plan  which  is a
multiemployer plan within the meaning of Section 3(37) of ERISA.

         "NASD" means the National Association of Securities Dealers.

         "NASDAQ" means Nasdaq National Market.

         "Net Receivables" has the meaning assigned to it in Section 6.10(a).

         "Permits" has the meaning assigned to it in Section 3.19.

         "Permitted  Settlement"  has  the  meaning  assigned  to it in  Section
6.10(b)(1).

         "Person" means an individual,  corporation,  association,  partnership,
joint venture,  trust,  estate,  limited  liability  company,  limited liability
partnership, or other entity or organization.

         "Real Property" means all real property and interests in real property,
including  fee  estates,   leaseholds  and   subleaseholds,   purchase  options,
easements,  licenses, rights to access, and rights of way, and all buildings and
other improvements  thereon, and other real property interests of the Company or
any of its subsidiaries, together with any additions thereto between the date of
this Agreement and the Closing Date.

         "Receivables" has the meaning assigned to it in Section 6.10(a).

         "Registration Rights Agreement" means the registration rights agreement
with respect to the TCGI Common Stock constituting the Merger Consideration,  in
the form attached as Exhibit A.

         "Reporting Period" has the meaning assigned to it in Section 6.5(b)(i).





<PAGE>




         "SDSC" has the meaning assigned to it in Section 3.12(d).

         "Section  6.12  Matters"  means the matters  specified in Section 6.12.

         "Securities  Act"  means  the  Securities  Act  of  1933,  as  amended,
including the rules and regulations thereunder.

         "Short Period" has the meaning assigned to it in Section 6.5(b)(i).

         "Software" has the meaning assigned to it in Section 3.14(j).

         "Sub Common Stock" has the meaning assigned to it in Section 2.8.

         "Surviving Corporation" has the meaning assigned to it in Section 2.1.

         "TCGI  Affiliated  Group"  has the  meaning  assigned  to it in Section
6.5(b)(i).

         "Tangible  Personal  Property" means all machinery,  equipment,  tools,
vehicles, furniture, leasehold improvements, office equipment, plant, inventory,
spare parts, and other tangible personal property of the Company,  together with
any additions thereto between the date of this Agreement and the Closing Date.

         "Tax" or "Taxes" means all federal,  state,  local and foreign  income,
gross receipts,  sales, use, employment,  payroll,  franchise,  profits, excise,
environmental,  property or other taxes,  estimated taxes, fees, stamp taxes and
duties,  assessments or charges of any kind whatsoever (whether payable directly
or by withholding),  together with any interest and any penalties,  additions to
tax or additional amounts imposed by any taxing authority with respect thereto.

         "Tax Claim" has the meaning assigned to it in Section 6.5(g).

         "Tax Return" means any return or report  required to be filed under any
statute, rule or regulation relating to Taxes.

         "TCGI  Common  Stock" means Class A Common  Stock,  par value $0.01 per
share, of TCGI.

         "Tenaya Payment" has the meaning assigned to it in Section 6.11.






<PAGE>



         "Working Capital" has the meaning assigned to it in Section 2.9.

         "Working Capital Amount" has the meaning assigned to it in Section 2.9.

         1.2 Knowledge.  For purposes of this Agreement,  the terms "knowledge,"
"to  the   knowledge  of"  and  similar   formulations,   with  respect  to  the
Stockholders,  shall mean the knowledge, after making due inquiry, of Neal Blue,
Linden  S.  Blue,  Neal  Karsten  Blue,  James R.  Edwards,  John E.  Jones  and
Pushpendra Mohta.


SECTION 2     THE MERGER; CONVERSION OF SHARES; EFFECT OF MERGER

         2.1 The Merger.  Subject to the terms and conditions  hereof, as of the
Effective Time, Sub shall be merged with and into the Company as provided herein
(the "Merger").  Thereupon, the corporate existence of the Company, with all its
purposes,  powers and objects,  shall continue unimpaired by the Merger, and the
corporate  identity and  existence  of Sub,  with all the  purposes,  powers and
objects of Sub, shall be merged with and into the Company,  and the Company,  as
the corporation surviving the Merger (sometimes herein referred to as "Surviving
Corporation"),  shall be fully  vested  therewith.  The separate  existence  and
corporate organization of Sub shall cease as of the Effective Time.

         2.2 Closing.  Unless this Agreement  shall have been terminated and the
transactions  herein  contemplated shall have been abandoned pursuant to Section
9, the  consummation  of the Merger (the "Closing") will take place on such date
(the  "Closing  Date")  as TCGI and the  Stockholders  shall  mutually  agree in
writing,  which  date  shall be no  later  than ten  (10)  business  days  after
satisfaction or waiver of the conditions set forth in Section 7.1(c) and 7.2(c),
at the offices of Dow,  Lohnes & Albertson,  1200 New  Hampshire  Avenue,  N.W.,
Washington,  D.C. 20036,  unless another date, time or place is agreed to by the
parties hereto.

         2.3 Effective Time. As promptly as practicable  after the  satisfaction
or, if permissible, waiver of the conditions set forth in Section 7, the parties
hereto  shall  cause the Merger to be  consummated  by filing a  certificate  of
merger (the "Certificate of Merger") with the Secretary of State of the State of
Delaware  in such form as  required  by, and  executed  in  accordance  with the
relevant  provisions of, Delaware Law (the date and time of such filing, or such
later date or time as set forth therein, being the "Effective Time").

         2.4  Certificate  of  Incorporation.  As of  the  Effective  Time,  the
Certificate of Incorporation of the Surviving Corporation shall be in the form





<PAGE>



the existing  Certificate of  Incorporation  of Sub, except that the name of the
Surviving  Corporation shall be changed to be "CERFnet Services,  Inc." From and
after the Effective Time, said Certificate of Incorporation shall be, and may be
separately  certified  as, the  Certificate  of  Incorporation  of the Surviving
Corporation.  

         2.5  Bylaws.  As of the  Effective  Time,  the Bylaws of the  Surviving
Corporation  shall be in the form of the existing  Bylaws of Sub. From and after
the Effective  Time, the same may be altered,  amended or repealed in accordance
with law, the Certificate of Incorporation of the Surviving  Corporation or said
Bylaws.

         2.6  Directors.  As of the Effective  Time, the members of the Board of
Directors  of the  Surviving  Corporation  shall be the  members of the Board of
Directors of Sub immediately before the Effective Time.

         2.7 Officers.  As of the Effective  Time, the officers of the Surviving
Corporation shall be the officers of Sub immediately before the Effective Time.

         2.8  Conversion.  As of the Effective Time, by virtue of the Merger and
without  any  further  action on the part of the  Company,  Sub,  the  Surviving
Corporation or any holder of the following securities:

                  (a)  All  of  the Company   Shares   issued  and   outstanding
immediately  prior to the Effective  Time (other than any shares to be cancelled
pursuant to Section  2.8(e)) shall be converted  into  2,100,000  shares of TCGI
Common Stock, in the aggregate, allocable with respect to such Company Shares in
the amounts set forth in a certificate (the "Instructions") delivered to TCGI by
the Stockholders not less than five (5) business days prior to the Closing Date,
which Instructions  shall be executed by each of the Stockholders,  Neal Karsten
Blue and  Pushpendra  Mohta.  Each of the  Stockholders,  Neal  Karsten Blue and
Pushpendra  Mohta hereby  waives all rights to receive any portion of the Merger
Consideration   pursuant  to  this   Agreement   other  than   pursuant  to  the
Instructions.

                  (b) All Company  Shares converted  pursuant to Section  2.8(a)
shall no longer be outstanding and shall  automatically be cancelled and retired
and shall cease to exist,  and each certificate  previously  evidencing any such
Company  Shares  shall  thereafter  represent  the  right to  receive,  upon the
surrender of such  certificate,  in  accordance  with the  provisions of Section
2.10,   certificates  evidencing  the  Merger  Consideration  to  be  issued  in
consideration  therefor,  as provided in this  Section  2.8. The holders of such
certificates  previously evidencing such Company Shares outstanding  immediately






<PAGE>



prior to the Effective  Time shall cease to have any rights with respect to such
Company Shares except as otherwise provided herein or by law.

                  (c) The "Merger  Consideration"  shall consist of two  million
one hundred thousand (2,100,000) shares of TCGI Common Stock.

                  (d)(i)  Each of the 1,000  shares of common  stock,  par value
$.01 per share,  of Sub ("Sub  Common  Stock")  which is issued and  outstanding
immediately  prior to the Effective  Time shall be converted into and become one
validly issued,  fully paid and  nonassessable  share of common stock, par value
$.01 per share,  of the Surviving  Corporation  ("Surviving  Corporation  Common
Stock"); and (ii) the certificates  representing all of the shares of Sub Common
Stock issued and  outstanding  immediately  prior to the Effective Time shall be
cancelled and retired and shall cease to exist.

                  (e) Each of the Company  Shares  held in the  treasury  of the
Company immediately prior to the Effective Time shall automatically be cancelled
and  extinguished  without any  conversion  thereof and no payment shall be made
with respect thereto.

        2.9 Working Capital.

                  (a)  Working Capital  Requirement.  Immediately  prior  to the
Effective  Time,  the Company  shall have,  after  giving  effect to the CERFnet
Germany Transactions described in Section 6.9 and all capital contributions made
by the Stockholders to the Company during the 1997 calendar year, current assets
(including cash) in excess of current liabilities,  as reflected on the adjusted
balance sheet of the Company, as of the Closing Date ("Working Capital"),  equal
to not  less  than  one  million  dollars  ($1,000,000)  (the  "Working  Capital
Amount").  Such adjusted  balance sheet shall reflect all capital  contributions
made by the  Stockholders to the Company during the 1997 calendar year and shall
not reflect  (i) any current or accrued  liability  or expense  with  respect to
legal fees incurred in connection  with the  transactions  contemplated  by this
Agreement, payable by or for the account of the Company, all of which fees shall
be paid or assumed by the Stockholders on or prior to the Closing Date, (ii) the
deferred  income taxes of the Company or (iii) any liabilities or assets arising
from the Section  6.12  Matters.  Notwithstanding  any other  provision  of this
Agreement, (i) to the extent that such adjusted balance sheet of the Company, as
of the Closing Date, reflecting the results of operations in the ordinary course
of business  (consistent with Section 3.7 and Section 5) from and after the date
hereof, would otherwise reflect Working Capital of less than the Working Capital
Amount,  the  Stockholders  shall provide a capital  contribution to the Company






<PAGE>



prior to the  Effective  Time,  in cash,  in such amount as is  estimated  to be
required to make the Working Capital of the Company equal to the Working Capital
Amount as of the Closing Date, and (ii) to the extent that such adjusted balance
sheet  of the  Company,  as of the  Closing  Date,  reflecting  the  results  of
operations in the ordinary course of business  (consistent with Sections 3.7 and
Section  5) from and after the date  hereof,  would  otherwise  reflect  Working
Capital in excess of the  Working  Capital  Amount,  the  Surviving  Corporation
shall,  to the  extent  set  forth in  Section  2.9(d),  make a  payment  to the
Stockholders on the Closing Date, in immediately available funds.

                           (b) Manner of Determining Working Capital.  Working
Capital of the Company will be determined finally in accordance
with the following procedures:

                           (1) The  Stockholders  shall  prepare  and deliver to
TCGI  not  later  than  three  (3)  business  days  before  the  Closing  Date a
preliminary  settlement  statement which shall set forth the Stockholders'  good
faith estimate of Working Capital.  The preliminary  settlement  statement shall
contain  all  information  reasonably  necessary  to estimate  Working  Capital,
including  without  limitation any capital  contributions to the Company made by
the  Stockholders  during the 1997 calendar year, and such other  information as
may be reasonably requested by TCGI and Sub.

                           (2) As promptly as possible after the Closing, but in
any event not later than  thirty  (30) days after the  Closing  Date,  TCGI will
deliver to the Stockholders,  a statement setting forth TCGI's  determination of
Working Capital and the calculation thereof.  TCGI's statement shall contain all
information  reasonably  necessary to determine Working Capital,  and such other
information  as may be  reasonably  requested by the  Stockholders.  If GATC, as
representative acting on behalf of all of the Stockholders,  disputes the amount
of Working  Capital  determined by TCGI, it shall deliver to TCGI within fifteen
(15) days after its receipt of TCGI's  statement a statement  setting  forth its
determination  of the  amount of Working  Capital.  If GATC,  as  representative
acting on behalf of all of the Stockholders  notifies TCGI of the  Stockholders'
acceptance of TCGI's statement,  or if GATC, as representative  acting on behalf
of all of the Stockholders fails to deliver its statement within the fifteen-day
period  specified in the preceding  sentence,  TCGI's  determination  of Working
Capital shall be conclusive and binding on the parties as of the last day of the
fifteen-day period.

                           (3) TCGI and the  Stockholders  shall use good  faith
efforts to resolve any dispute  involving the  determination of Working Capital.
If the  parties  are unable to resolve  the  dispute  within  fifteen  (15) days
following the delivery of the Stockholders' statement pursuant to Section






<PAGE>



2.9Ib)(2),  TCGI and the Stockholders shall jointly designate Deloitte & Touche,
LLP and Price  Waterhouse LLP to resolve the dispute.  If such  accountants  are
unable to resolve the dispute within thirty (30) days of their appointment, such
accountants shall designate a third  independent  accounting firm to resolve the
dispute.  The resolution of such  accountant or accountants of the dispute shall
be final and  binding on the  parties.  Any fees of any such  third  independent
accountant shall be split equally between the parties.

                  (c) Payments to Reflect  Working  Capital  Deficit or Surplus.
(i) If the Working Capital as finally  determined  pursuant to Section 2.9(b) is
determined to equal less than the Working Capital Amount, the Stockholders shall
pay to the Company, in cash in immediately  available funds within five (5) days
after the date on which the Working  Capital is  determined  pursuant to Section
2.9(b),  the  difference  between  the  Working  Capital  Amount and the Working
Capital;  and (ii) if Working Capital as finally determined  pursuant to Section
2.9(b)  is  determined  to equal  more  than the  Working  Capital  Amount,  the
Surviving  Corporation  shall pay to the  Stockholders,  in cash, in immediately
available  funds  within  five (5) days after the date on which  such  amount is
determined,  the difference  between the Working Capital and the Working Capital
Amount, subject to Section 2.9(d).

                  (d)  Notwithstanding  anything  in  this  Section  2.9  to the
contrary, in no event shall the amount of any payment required to be made to the
Stockholders  under this  Section  2.9 exceed  the  aggregate  amount of capital
contributions  made by the  Stockholders to the Company during the 1997 calendar
year.

         2.10 Exchange  Procedures.  Upon surrender by the holder thereof of all
certificates   which   immediately  prior  to  the  Effective  Time  represented
outstanding  Company  Shares  (the  "Certificates")  for  cancellation  to TCGI,
subject to the  provisions of applicable  law, the holders of such  Certificates
shall be entitled to receive in exchange  therefor  the number of shares of TCGI
Common  Stock that each such  holder has the right to  receive  pursuant  to the
provisions  of Section  2.8. The  Certificates  so  surrendered  pursuant to the
preceding sentence shall forthwith be cancelled.

         2.11 Distribution With Respect to Unexchanged  Stock. No shares of TCGI
Common Stock that a holder of Certificates  has the right to receive pursuant to
the provisions of this Section 2 shall be issued to any such holder, pursuant to
Section 2.10,  until the holder of record of such  Certificate or his designated
representative shall surrender such Certificate.

         2.12 Further Ownership Rights in the Company Shares. The shares of TCGI





<PAGE>



Common  Stock  issued in  exchange  for  Certificates  duly  presented  to TCGI,
pursuant  to  Section  2.10,  shall  be  deemed  to  have  been  issued  in full
satisfaction  of all rights under this  Agreement  pertaining to Company  Shares
theretofore represented by such Certificates.

         2.13 Withholding Rights. The Surviving  Corporation,  TCGI or Sub shall
be entitled to deduct and  withhold  from the  consideration  otherwise  payable
pursuant to this  Agreement to any holder of Company  Shares,  as the  Surviving
Corporation,  TCGI or Sub is required to deduct and withhold with respect to the
making of such  payment  under the Code,  or any  provision  of state,  local or
foreign  tax law. To the extent  that  amounts are so withheld by the  Surviving
Corporation,  TCGI or Sub,  such  withheld  amounts  shall  be  treated  for all
purposes of this Agreement as having been paid to the holder of Company  Shares,
in respect of which such  deduction  and  withholding  was made by the Surviving
Corporation,  TCGI or Sub. In the event that TCGI should  conclude  that amounts
may be required  by law to be deducted  and  withheld  pursuant to this  Section
2.13,  TCGI shall notify the  Stockholders  no later than five (5) business days
prior  to  the  Closing  Date,  and  TCGI  shall  afford  the  Stockholders  the
opportunity to minimize or eliminate any such requirement.

         2.14 No Liability. None of the Surviving Corporation, TCGI or Sub shall
be liable to any Person in respect of any shares of TCGI Common Stock  delivered
to a public official pursuant to any applicable  abandoned property,  escheat or
similar law to the extent  Certificates  representing  such shares have not been
duly  surrendered for  cancellation to TCGI pursuant to Section 2.10 on or prior
to such delivery. None of the Surviving Corporation, TCGI or Sub shall be liable
to any Person in respect of any  Company  Shares  owned or held by such  Person,
other than the  delivery  at Closing of  certificates  representing  TCGI Common
Stock in accordance with the Instructions.

         2.15 Stock Transfer  Books.  At the Effective  Time, the stock transfer
books of the Company shall be closed, and there shall be no further registration
of transfers of Company Shares  thereafter on the records of the Company.  On or
after the Effective  Time, any  Certificates  presented to TCGI or the Surviving
Corporation  for any reason shall be converted  into shares of TCGI Common Stock
as provided in this Section 2.

         2.16 Effect of the Merger. At and after the Effective Time, the Company
shall  possess all the rights,  privileges,  immunities,  powers and purposes of
each of the Company and Sub;  all the  property,  real and  personal,  including
subscriptions  to shares,  causes of action and every other asset of the Company
and Sub shall vest in the Surviving Corporation without further act or deed; and
the Surviving Corporation shall assume and be liable for all the liabilities,





<PAGE>



obligations  and  penalties  of the  Company  and Sub.  No demand  for any cause
existing  against  either the  Company or Sub,  or any  stockholder,  officer or
director thereof,  shall be released or impaired by the Merger, and no action or
proceeding, whether civil or criminal, then pending by or against the Company or
Sub,  or any  stockholder,  officer  or  director  thereof,  shall  abate  or be
discontinued  by  the  Merger,  but  may be  enforced,  prosecuted,  settled  or
compromised as if the Merger had not occurred,  or the Surviving Corporation may
be substituted in any such action or special  proceeding in place of the Company
or Sub.

         2.17 Further Assurances.  If, at any time after the Effective Time, the
Surviving  Corporation  shall  consider or be advised  that any  further  deeds,
assignments or assurances in law or in any other things are necessary, desirable
or proper to vest, perfect or confirm, of record or otherwise,  in the Surviving
Corporation  the title to any property  rights of the Company or Sub acquired or
to be acquired by the  Surviving  Corporation  by reason of, or as of result of,
the  Merger,  each  Stockholder,  the  Company and Sub agree that they and their
officers and directors shall and will execute and deliver all such proper deeds,
assignments  and  assurances  in law and do all things  necessary,  desirable or
proper to vest,  perfect  or  confirm  title to such  property  or rights in the
Surviving  Corporation  and otherwise to carry out the purpose of this Agreement
(it being understood and agreed that any out-of-pocket  expenses incident to the
foregoing  shall  be  borne  by  the  Surviving   Corporation  and  not  by  the
Stockholders),  and that the officers  and  directors of the Company and Sub and
the officers and directors of the Surviving  Corporation are fully authorized in
the name of the Company, Sub, the Surviving Corporation or otherwise to take any
and all such action.


SECTION 3      REPRESENTATIONS AND WARRANTIES OF THE STOCKHOLDERS

         The Stockholders,  jointly and severally, represent and warrant to TCGI
as follows:

         3.1 Organization, Standing, and Authority.

                  (a)  The  Company  is a corporation  duly  organized,  validly
existing,  and in good standing  under the laws of the State of Delaware and has
all  necessary  corporate  power  and  authority  to  own,  lease,  and  use its
properties  as now owned,  leased and used,  and to conduct its  business as now
conducted.   The  Company  is  duly  qualified  to  do  business  as  a  foreign
corporation,  and is in good standing,  in each jurisdiction where the character
of its  properties  owned,  operated  or leased or the nature of its  activities
makes such qualification necessary, except for such failures which, when taken





<PAGE>



together  with all  other  such failures, would not have a Material Adverse 
Effect.

                  (b) GATC is a corporation  duly organized,  validly  existing,
and in  good  standing  under  the  laws of the  State  of  Wyoming  and has all
necessary  corporate power and authority to own, lease and use its properties as
now owned,  leased and used, and to conduct its business as now conducted.  GATC
has the  requisite  corporate  power and  authority  to execute and deliver this
Agreement and the documents  contemplated  hereby and to perform and comply with
all of the terms,  covenants and conditions to be performed and complied with by
GATC hereunder and thereunder.

                  (c) GA is a corporation duly organized,  validly existing, and
in good standing under the laws of the State of California and has all necessary
corporate power and authority to own, lease and use its properties as now owned,
leased  and  used,  and  to  conduct  its  business  as now  conducted.  GA is a
wholly-owned  subsidiary  of GATC.  GA has the  requisite  corporate  power  and
authority to execute and deliver this  Agreement and the documents  contemplated
hereby and to perform and comply with all of the terms, covenants and conditions
to be performed and complied with by GA hereunder and thereunder.

         3.2 Authorization and Binding Obligation. The execution,  delivery, and
performance  of this Agreement by each of the  Stockholders  and the Company has
been duly authorized by all necessary corporate actions on the part of each such
Stockholder and the Company, respectively. This Agreement has been duly executed
and  delivered by each  Stockholder  and the Company and  constitutes,  and each
other document  contemplated hereby to which any Stockholder or the Company is a
party,  when  executed  and  delivered  by  the  other  parties  thereto,   will
constitute,  the legal,  valid, and binding  obligation of each such Stockholder
and the Company,  respectively,  enforceable  against it in accordance  with its
terms  except  as the  enforceability  hereof  or  thereof  may be  affected  by
bankruptcy,  insolvency,  moratorium or similar laws affecting creditors' rights
generally,  and  by  general  equitable  principles  (whether  considered  in  a
proceeding at law or in equity).

         3.3 Absence of Conflicting Agreements.  Except as set forth on Schedule
3.3,  the  execution,  delivery,  and  performance  of  this  Agreement  and the
documents  contemplated  hereby by the  Company  and the  Stockholders  (with or
without the giving of notice, the lapse of time, or both) do not:

                  (d) violate or conflict with any term or provision of the
certificate of incorporation or bylaws (or other charter documents) of either of
the Stockholders or the Company;





<PAGE>




                  (b)  except  as would  not  have a  Material  Adverse  Effect,
conflict  with or violate any law,  rule,  regulation,  order,  writ,  judgment,
injunction,   decree,  determination  or  award  applicable  to  either  of  the
Stockholders or the Company;

                  (c) except as would not have a Material Adverse Effect, result
in any breach of, or  constitute  a default  (or event  which with the giving of
notice or lapse of time,  or both,  would  become a default)  under,  or give to
others any rights of termination, amendment, acceleration or cancellation of, or
result in the creation of any Lien on any of the assets or  properties of either
Stockholder or the Company  pursuant to, any note,  bond,  mortgage,  indenture,
contract,  agreement,  lease, license,  permit, franchise or other instrument to
which  either  Stockholder  or the  Company  is a party or by which  any of such
assets or properties is bound or affected; or

                  (d)  result in the creation of any Lien on the Company Shares
or the properties and assets of the Company.

         3.4 Capitalization.

                  (a) As of the date hereof, the Company is  authorized to issue
2,000  shares of Company  Common  Stock,  of which  1,231  shares are issued and
outstanding,   all  of  which  are  owned  legally  and   beneficially   by  the
Stockholders.  All of the Company  Shares issued and  outstanding as of the date
hereof are duly authorized and validly issued,  fully paid and nonassessable and
were  not  issued  in  violation  of any  preemptive  rights  or any  applicable
securities  laws and are free and clear of all Liens of  whatever  nature  other
than such  restrictions  on transfer as may arise  under  state  and/or  federal
securities  laws.  The  Company  Common  Stock  constitutes  the  only  class of
authorized  capital  stock of the  Company.  Except for the  provisions  of this
Agreement, the Registration Rights Agreement and the Incentive Agreements, there
are no subscriptions,  options,  warrants, call rights,  participation rights or
rights of conversion or other rights,  agreements,  arrangements  or commitments
relating  to the  Company's  capital  stock  obligating  the  Company  or either
Stockholder either to issue or sell any shares of the Company's capital stock or
any  options,  warrants or  participation  rights with respect  thereto,  or any
voting agreements,  voting trust agreements,  shareholder  agreements or similar
agreements relating to the voting of any of the Company's capital stock.

                  (b) All of the shares of issued and outstanding  capital stock
of CERFnet Germany are owned, as of the date hereof, legally and beneficially by
the Company,  have been duly authorized and validly  issued,  are fully paid and
nonassessable  and were not issued in violation of any preemptive  rights or any
applicable securities laws. Except as contemplated under the CERFnet Germany





<PAGE>



Dividend,   there  are  no  subscriptions,   options,   warrants,  call  rights,
participation  rights or  rights  of  conversion  or other  rights,  agreements,
arrangements  or  commitments  relating to the capital stock of CERFnet  Germany
obligating  CERFnet Germany or the Company either to issue or sell any shares of
CERFnet Germany common stock, or any option,  warrants or  participation  rights
with  respect  thereto,  or any  voting  agreements,  voting  trust  agreements,
shareholder  agreements or similar  agreements  relating to the voting of any of
such  stock.  The Company  owns,  as of the date  hereof,  the shares of CERFnet
Germany  common stock free and clear of all Liens of whatever  nature other than
as  contemplated  under the CERFnet  Germany  Dividend and such  restrictions on
transfer as may arise under state and/or federal securities laws.

         3.5 Share Ownership.  As of the date hereof, the Stockholders hold good
and valid title to all, and as of the Closing Date, the  Stockholders  will hold
good and valid title to all (other than the shares of Company Common Stock to be
transferred pursuant to the Incentive Agreements,  of which good and valid title
will be held by Neal Karsten Blue and  Pushpendra  Mohta,  respectively)  of the
issued and  outstanding  Company  Common  Stock,  free and clear of all Liens of
whatever  nature  other than such  restrictions  on  transfer as may arise under
state and/or federal securities laws.


         3.6  Subsidiaries;  Joint  Ventures.  Except for CERFnet  Germany,  the
Company's interest in which is to be distributed to the Stockholders pursuant to
Section  6.9(a),  the  Company  has no  subsidiaries  and is  not,  directly  or
indirectly,  a  shareholder  of and has no equity  investments  in, and does not
control any  Person;  and (except  for  CERFnet  Germany)  the Company  does not
conduct any part of its business  through,  any subsidiaries or any other Person
in which it has an equity investment.

         3.7 Financial Statements.  Attached hereto as Schedule 3.7 are true and
complete copies of (i) audited  financial  statements of the Company  containing
balance  sheets  and  statements  of  income  and  cash  flows as at and for the
Company's  fiscal year ended  December 31, 1995,  and (ii) an unaudited  balance
sheet and  statement  of income and cash flows of the  Company as at and for the
eleven months ended  November 30, 1996 (the items referred to in clauses (i) and
(ii), collectively,  the "Financial Statements").  The Financial Statements have
been  prepared from the books and records of the Company,  on an  unconsolidated
basis,  have been  prepared in accordance  with  generally  accepted  accounting
principles consistently applied and maintained throughout the periods indicated,
accurately reflect the books,  records and accounts of the Company, are complete
and correct in all material respects, and present fairly the financial condition
of the Company, as at their respective dates and the results of operations for





<PAGE>



the periods then ended  (except as noted  therein and, with respect to unaudited
financial  statements,  for normal year-end audit adjustments and except for the
absence of notes to such financial statements).

         3.8  Undisclosed  Liabilities.  Except as disclosed on Schedule 3.8 and
the  notes  to the  Company's  interim  financial  statement  as of and  for the
eleven-month period ended November 30, 1996, there is no obligation or liability
of the Company,  except: (i) such liabilities and obligations that are reflected
in or reserved on the Company's audited Financial  Statements,  as of or for the
period  ending  December 31, 1995, or as would not be required to be included in
the  Company's  audited  Financial  Statements,  as of or for the period  ending
December 31, 1995, under generally accepted  accounting  principles or (ii) such
liabilities  and  obligations  that were incurred after December 31, 1995 in the
ordinary course of business  consistent with past practice or (iii) which do not
individually or in the aggregate exceed fifty thousand dollars ($50,000).

         3.9  Conduct of Business in Ordinary  Course.  Except as  disclosed  on
Schedule 3.9 or in the notes to the Company's interim financial  statements,  as
of or for the eleven-month  period ended November 30, 1996, included in Schedule
3.7, since December 31, 1995, the Company has conducted its business only in the
ordinary course and has not:

                  (a)  suffered  any  change  in  its   business,   assets,   or
properties,  taken as a whole (after giving effect to reserves  reflected on the
Financial Statements) including any damage,  destruction,  or loss affecting any
assets used or useful in the conduct of the business of the Company, which would
have a Material Adverse Effect (it being recognized that CERFnet Germany is in a
start-up phase and is incurring losses in its operations);

                  (b) made any material  increase in compensation  payable or to
become payable to any of its employees, or any bonus payment made or promised to
any employee,  or any material change in personnel  policies,  Employee  Benefit
Plans or other Compensation Arrangements affecting the employees of the Company;

                  (c) made any sale, assignment, lease, or other transfer of any
material properties other than in the normal and usual course of business;

                  (d) suffered any  material  write-down  of the value of any of
its  properties  or any  material  write-off  as  uncollectible  of any accounts
receivable,  in either case, in excess of the reserves  provided therefor in the
Financial Statements of November 30, 1996;





<PAGE>




                  (e) declared or paid any dividend or similar distribution with
respect to its  capital  stock or made or  declared  any split,  combination  or
reclassification of its capital stock or any issuance of any other securities in
respect  of, in lieu of or in  substitution  for  shares of its  capital  stock,
except  that the (i)  Company  has  issued  shares of Company  Common  Stock and
Company  Preferred Stock in substitution  for the issued and outstanding  shares
thereof,  solely to  reflect  the  change  in name of the  Company  to  "CERFnet
Services,  Inc."  subsequent  to the  original  issuance of such shares and (ii)
CERFnet  Germany  has  issued  shares of  CERFnet  Germany  common  stock to the
Company,  in substitution for the issued and outstanding shares thereof,  solely
to  reflect  the  change in name of the  Company  to  "CERFnet  Services,  Inc."
subsequent  to the  original  issuance  of such  shares and except for the stock
reclassification contemplated by the Company Charter Amendment;

                  (f)  made  any  other  payment  or   distribution   to  either
Stockholder  or any of its other  Affiliates,  except in the ordinary  course of
business;

                  (g) incurred any indebtedness for borrowed money which has not
been repaid;

                  (h)  transferred  or granted any right under,  or entered into
any settlement  regarding the breach or  infringement  of, any license,  patent,
copyright,  trademark,  trade name, franchise, or similar right, or modified any
existing  right  relating  to its  business  except  in the  ordinary  course of
business; or

                  (i) made any  change  in  accounting  methods,  principles  or
practices affecting its assets, liabilities or business.

         3.10 Title to and Condition of Real Property.  Schedule 3.10 contains a
complete and accurate  description of all the Real Property and the interests of
the Company therein (including street address, legal description, owner, and use
and the  location of all  improvements  thereon).  The Real  Property  listed on
Schedule 3.10 includes all real property  interests used to conduct the business
of the Company as now  conducted.  The Company  does not own any Real  Property.
With respect to each leasehold or  subleasehold  interest  included in such Real
Property,  so long as the  Company  fulfills  its  obligations  under  the lease
therefor,  the  Company  has  enforceable  rights  to  nondisturbance  and quiet
enjoyment.

         3.11 Title to and  Condition of Tangible  Personal  Property.  Schedule
3.11 lists all material items of Tangible  Personal  Property  having a value in
excess of five hundred dollars ($500).  The Tangible Personal Property listed on
Schedule 3.11 includes all material items of tangible personal property used to





<PAGE>



conduct  the  business  of the  Company as now  conducted,  except for  Tangible
Personal  Property sold,  transferred  or otherwise  disposed of in the ordinary
course of business  between  the date hereof and the Closing  Date for which the
Company has obtained suitable replacement property, as necessary in the ordinary
course of business.  Except as described in Schedule  3.11, the Company owns and
has good  title to each  item of  Tangible  Personal  Property,  and none of the
Tangible  Personal  Property owned by the Company is subject to any Lien, except
for liens for current  taxes not yet due and payable or which may  thereafter be
paid without penalty.

         3.12 Customers and Contracts.

                  (a)  Attached  as Schedule  3.12(a) is a copy of the  customer
list of the Company, as of December 31, 1996, used in the ordinary course of the
Company's  business,  which copy is true and complete,  taken as a whole, in all
material  respects.  Except as  identified on Schedule  3.12(a),  as of the date
hereof (and as of the end of the immediately  preceding  calendar month), to the
knowledge of the  Stockholders,  none of the  customers  identified on such list
intends to reduce or has threatened,  orally or in writing, to reduce materially
its purchases  from or business  dealings with the Company  whether by reason of
the consummation of this Agreement or otherwise.

                  (b)  Schedule  3.12(b) set forth a true and  complete  (in all
material respects) list of all Contracts (other than customer contracts with any
customers not identified in Schedule  3.12(a)).  Except as set forth on Schedule
3.12(b),  each Contract which (i) is reasonably likely to involve  consideration
of more than two thousand dollars ($2,000), in the aggregate, and (ii) (A) has a
remaining term of more than 30 days or (B) is not cancellable without penalty or
further payment without more than 30 days' notice (a "Material Contract"), is in
full force and effect and is valid, binding and enforceable against the Company,
assuming due authorization,  execution and delivery by the other parties thereto
(and, to the knowledge of the Stockholders, against other parties) in accordance
with its  respective  terms.  Except as set forth on  Schedule  3.12(b),  to the
knowledge of the Stockholders, there is not under any such Material Contract any
material  default by any party thereto or any event that,  after notice or lapse
of time or both, could constitute a default of any material  provision  thereof.
True and  complete  copies of each  written  Contract  (or a  memorandum  of all
material oral  Contracts)  have been delivered or made available to TCGI. To the
knowledge of the  Stockholders,  the Company has not received  notification from
any party to a Material Contract of such party's intention (i) to terminate such
Contract or amend the terms  thereof,  (ii) to refuse to renew the Contract upon
expiration of its term, or (iii) to renew the Contract upon expiration only on






<PAGE>



terms and conditions which are more onerous than those now existing.  Subject to
obtaining  the  Consents  listed on  Schedule  3.13,  the  consummation  of this
Agreement  will  not  result  in an  impairment  or  termination  of  any of the
Company's  rights under any such  Contract,  including  without  limitation  any
Material  Contract  between  the Company and any  subscriber  or other  customer
identified on Schedule 3.12(a).

                  (c) To the knowledge of the Stockholders,  the Company has not
censored or otherwise  exercised any form of editorial  control over any content
or information  provided by,  carried or transmitted on behalf of,  customers on
the network or service operated by the Company.

                  (d) GA is party to that certain San Diego Supercomputer Center
Cooperative Agreement,  ASC-8902825,  by and between GA and the National Science
Foundation,  pursuant to which GA operates  the San Diego  Supercomputer  Center
(the "SDSC") until September 30, 1997.  Such  Supercomputer  Center  Cooperative
Agreement  is in full force and effect and is valid,  binding,  and  enforceable
against GA (assuming due authorization, execution and delivery by the SDSC) and,
to the knowledge of the  Stockholders,  against the SDSC, in accordance with its
terms.  The Stockholders  acknowledge that certain  equipment of the Company set
forth on Schedule 3.11 is located at the SDSC.

         3.13  Consents.  Except  for the  consent  required  under the HSR Act,
referred to in Section  6.4, and the Consents  described  in Schedule  3.13,  no
consent,  approval,  permit,  or  authorization  of, or declaration to or filing
with, any  governmental  or regulatory  authority,  or any other third party, is
required for the Company and the  Stockholders  to consummate this Agreement and
the transactions contemplated hereby.

         3.14  Intangibles.  Schedule  3.14 is a true and  complete  list of all
Intangibles owned by or licensed to the Company,  with an indication as to which
of such items are owned by the Company and which are licensed to the Company.

                  (a) The patents,  registered  trademarks  and  copyrights  set
forth in  Schedule  3.14  have  been duly  issued  and have not been  cancelled,
abandoned or otherwise terminated.

                  (b) To the knowledge of the Stockholders,  the Company has not
received  notice,  orally or in writing,  that any other person or entity claims
any  interest in any  Intangibles  of the Company,  and to the  knowledge of the
Stockholders, no such other Person has, or has made, such a claim.

                  (c)  Neither  the  Stockholders  nor the  Company  has sent or
otherwise communicated to any other Person any notice, charge, claim or





<PAGE>



assertion  of, or has any  knowledge  of, any present,  impending or  threatened
infringement by any other Person of any of the Intangibles, and to the knowledge
of the Stockholders, no third party has infringed upon or misappropriated any of
the Intangibles.

                  (d) The Company is not infringing upon any  trademarks,  trade
names, service marks, service names,  copyrights,  patents, patent applications,
nor to the  knowledge  of the  Stockholders,  upon any trade  secrets,  computer
programs and program rights and similar intangible  property rights owned by any
other Person or Persons,  and there is no claim or action  pending or threatened
with respect thereto.

                  (e) Except as set forth on Schedule  3.14, the Company has not
licensed any of the listed  Intangibles to any other Person,  nor does any other
Person have any option or other right to acquire any of the Intangibles.

                  (f) The  Intangibles  listed on  Schedule  3.14  comprise  all
material  intangible  property  interests  necessary to conduct the business and
operations of the Company as now conducted.

                  (g) Except as set forth on Schedule 3.14, no present or former
employee, officer, director,  shareholder, agent or contractor of Seller has any
ownership interest, direct or indirect, in any Intangibles.

                  (h) Without limiting the other  representations and warranties
contained in this  Agreement,  the  Stockholders  make the following  additional
representations  and  warranties  with  respect to the  software  and  databases
identified in Schedule 3.14 (collectively,  the "Software"). Except as disclosed
in Schedule 3.14: (A) the Company has or will have by Closing  delivered to TCGI
complete,  current copies of all user and technical documentation related to the
Software  in its  possession;  (B) to the  knowledge  of the  Stockholders,  the
Software is in  machine-readable  form,  contains all current  revisions of such
Software,  and includes,  where applicable,  all computer  programs,  materials,
tapes,  know-how,  object  and source  codes  related  to the  Software;  (C) no
employee,  contractor or agent (directly or through  employees or subcontractors
or  sub-agents)  of the Company has developed or assisted in the  enhancement of
any of the Software or the development of any program or product based on any of
the Software or any part thereof  without  assigning all of such Person's rights
and interest in the same to Seller; (D) except as provided in the Contracts, the
Company  has no  obligation  to  compensate  any  Person  for  the  development,
enhancement,  creation of derivative  works, use, license or exploitation of any
of the Software. TCGI and Sub acknowledge and agree that the Stockholders and






<PAGE>



the Company have not made and hereby disclaim any  representation or warranty as
to the  merchantability or fitness for a particular purpose of the Software,  or
that the Software will operate in an uninterruptible or error-free manner.

         3.15  Insurance.  Schedule  3.15  is a true  and  complete  list of all
insurance  policies  of the  Company  that  insure any part of the  business  or
properties of the Company. All insurance policies listed on Schedule 3.15 are in
full force and effect,  providing coverage in such amounts (subject to customary
deductibles)  and of such scope as would be customary  for a business of similar
size in the same industry.  During the past three years, no insurance  policy of
the Company has been canceled by the insurer and no  application  of the Company
for insurance has been rejected by any insurer.

         3.16 Personnel.

                  (a) Employees and Compensation.  Schedule 3.16 contains a true
and  complete  list of all  employees  and all Persons  retained as  independent
contractors  of the Company and a description of all  compensation  arrangements
affecting them as of the date of this Agreement  (including  without  limitation
any   compensation   arrangement   between  any  such  employee  or  independent
contractor,  on the one hand, and the Company,  the Stockholders or any of their
respective  Affiliates,  stockholders  and control  persons,  on the other,  but
excluding (i) certain  agreements  between Neal Karsten Blue and such parties to
which the Company is not a party and (ii) any vested  benefits of such employees
or  independent  contractors  under GA's pension plan or 401(k) plan relating to
the period during which such employees or independent contractors were employees
of  GA).  The  employees  or  independent  contractors  of the  Company  and its
subsidiaries have executed the Company's standard form employee  confidentiality
agreement.

                  (b) Labor Relations.  The Company is not a party to or subject
to any collective bargaining  agreements.  Except as set forth on Schedule 3.16,
the Company is not a party to any written or oral  contract of  employment  with
any employee,  other than oral employment  agreements terminable at will without
penalty. No labor union or other collective bargaining unit represents or claims
to represent  any of the  employees of the Company.  There is no labor  dispute,
grievance,  strike or request  for union  representation  pending or  threatened
against  the  Company  relating  to or  materially  affecting  the  business  or
operations of the Company and, to the  knowledge of the Company,  there has been
no occurrence of any events which would give rise to any material labor dispute,
strike or request for representation.

                  (c) Employee Benefits and ERISA.

                           (i)  Schedule 3.16 also contains a true and complete





<PAGE>



list as of the date of this  Agreement of all of the Employee  Benefit Plans and
Compensation  Arrangements  in which any  employee of the Company  participates.
True and  complete  copies  of any  such  written  Employee  Benefit  Plans  and
Compensation  Arrangements have been furnished to TCGI, along with copies of any
employee handbooks or similar documents  describing such plans and arrangements.
Schedule 3.16 or the Company's  employee  handbooks  describe any such unwritten
Employee Benefit Plans and Compensation Arrangements.

                           (ii) Each  of  the   Employee   Benefit   Plans   and
Compensation  Arrangements has been administered in material compliance with its
own  terms  and  in  all  material  respects  with  ERISA,  the  Code,  the  Age
Discrimination in Employment Act, any other applicable  federal or state laws or
applicable laws of foreign jurisdictions.

                           (iii)  There exists no action, suit or claim (other
than routine  claims for benefits)  with respect to any of the Employee  Benefit
Plans  or  Compensation  Arrangements  pending  or,  to  the  knowledge  of  the
Stockholders, threatened against any of such plans or arrangements and no Person
has  informed the General  Counsel of the  Stockholders  or the Chief  Executive
Officer of the Company of facts which have led the General  Counsel or the Chief
Executive  Officer to believe that there is a  reasonable  basis for any action,
suit or claim under established California or Federal law.

                           (iv) No  Employee   Benefit   Plan  or   Compensation
Arrangement is a Multiemployer Plan, is subject to Title IV of ERISA or provides
medical  or death  benefits  after  termination  of  employment  (other  than as
required pursuant to Code Section 4980B).

         3.17 Taxes.

                  (a) Except as disclosed on Schedule  3.17: (i) the Company (or
the GA  Affiliated  Group) has filed or caused to be filed with the  appropriate
governmental  agencies  in the  respective  jurisdictions,  on or  prior  to the
respective  due  dates  (including  extensions)  for such Tax  Returns,  all Tax
Returns  required  to be filed  with  respect  to the  Company;  (ii) all of the
foregoing  Tax Returns are correct and  complete in all material  respects;  and
(iii) the Company (or the GA Affiliated Group) has paid or caused to be paid all
Taxes  shown on the  foregoing  Tax Returns  (and all Taxes  required to be paid
without  any  requirement  that a Tax Return be filed) or on any Tax  assessment
therefor  received by the Company (or by any other  member of the GA  Affiliated
Group,  to the  extent  that such Tax  assessment  was made with  respect to the
Company) to the extent  that such Taxes have become due,  except for Taxes being
contested in good faith by  appropriate  proceedings,  or, with respect to Taxes






<PAGE>



that have not yet become  due,  for which the Company has set aside on its books
reserves  deemed  adequate  with respect  thereto.  The  Stockholders  have made
available  true and  complete  copies of the  federal  income Tax Returns of the
Company to TCGI.  Except as otherwise  disclosed  in writing to TCGI,  all Taxes
payable by or with respect to the Company or relating to or  chargeable  against
the Company's  properties,  revenue or income from the date of the most recently
filed Tax Return  with  respect to such Taxes to the date hereof have been fully
paid or adequate  provision  has been made therefor as reflected on the books of
the Company.

                  (b) Except as disclosed on Schedule 3.17, (i) since January 1,
1994,  neither the Company nor the GA  Affiliated  Group has been subject to any
audit by any Tax authority,  (ii) no deficiencies that have been assessed by any
Tax authorities  against the Company, or the GA Affiliated Group with respect to
the Company are  outstanding;  (iii)  neither the Company nor the GA  Affiliated
Group has granted any extension of the limitation period applicable to any claim
for Taxes or assessments  insofar as any such claim relates to the Company;  and
(iv) the  Company  will not be  required  to include any amount in its income or
exclude any amount from its deductions in any Reporting  Period ending after the
Closing  Date by  reason  of a change  in  method  of  accounting  or use of the
installment  method of accounting  in any Reporting  Period prior to the Closing
Date.

                  (c)  The Company  is  a  member  of  an  affiliated  group  of
corporations  as  defined  in  Section  1504(a)  of the  Code  of  which  Tenaya
Corporation,  a Delaware corporation,  is the parent company (the "GA Affiliated
Group").  Except as disclosed on Schedule  3.17,  the Company is not and has not
been at any time a party to any  tax-sharing  agreement  or similar  arrangement
with any Person.

         3.18 Compliance.  Except as identified on Schedule 3.18, the Company is
not in  violation or default of any  material  provision of (i) any  instrument,
mortgage, deed of trust, loan, contract, commitment,  judgment, decree, order or
obligation  to which it is a party  or by which it or any of its  properties  or
assets are bound, to the extent such instrument,  mortgage, deed of trust, loan,
contract  or  commitment  constitutes  a  Material  Contract,  or,  (ii)  to the
knowledge of the Stockholders, any applicable provision of any federal, state or
local statute, rule or governmental regulation,  except, with respect to clauses
(i) or (ii) above, as individually or in the aggregate would not have a Material
Adverse  Effect.  To the  knowledge  of the  Stockholders,  the  Company has not
received any notice alleging or otherwise relating to any such noncompliance.

         3.19 Permits.  Schedule 3.19 lists all material  permits,  licenses and
authorizations issued by local, state and federal authorities, and






<PAGE>



applications  therefor  that  are held by the  Company  and that are used in the
conduct of the  business of the  Company  (the  "Permits").  The Company has all
Permits as are  reasonably  necessary  or  appropriate  to the  operation of its
business as presently  conducted.  Such Permits are in full force and effect and
no governmental  proceeding is pending or, to the knowledge of the Stockholders,
threatened,  that could result in the  revocation  or  limitation of any of such
Permits.  The  business  of the  Company  is in  material  compliance  with  the
requirements of all such Permits.

         3.20 Environmental Laws. To the knowledge of the Stockholders,  (i) the
Company's  operations  comply  in all  material  respects  with  all  applicable
Environmental  Laws and (ii) no material  violation of such  Environmental  Laws
exists with respect to any Real Property.  To the knowledge of the Stockholders,
none of the operations of the Company or any of its  subsidiaries  is subject to
any  judicial  or  administrative  proceeding  alleging  the  violation  of  any
Environmental  Law.  To the  knowledge  of the  Stockholders,  none of the  Real
Property is the subject of any federal or state investigation concerning any use
or release of any  Hazardous  Material (as defined  below).  The Company has not
received any citation,  directive or notice of any proceedings,  claims or other
actions  from  any  governmental  authority  arising  out  of the  ownership  or
occupation of the properties or premises of the Company or its  subsidiaries  or
the conduct of its respective operations.  To the knowledge of the Stockholders,
no  material  expenditure  on  behalf  of the  Company  in  connection  with the
operation of its business as  presently  conducted  will be required in order to
comply with any Environmental  Law. Neither the Company nor, to the knowledge of
the stockholders,  any  predecessor-in-title  to the Real Property has filed any
notice under federal or state law indicating past or present treatment,  storage
or disposal of a hazardous  waste or reporting a spill or release of a Hazardous
Material  into the  environment.  None of the  Company's  operations on the Real
Property involves the generation, transportation, treatment, storage or disposal
of Hazardous  Materials of  "Reportable  Quantity"  (as defined  under  CERCLA).
Except in accordance  with all  requirements  of law or as disclosed in Schedule
3.20,  neither  the  Company  nor any of its  subsidiaries  has  disposed of any
Hazardous Material of Reportable Quantity in, on or about the Real Property.

         3.21 Claims and Legal  Actions.  Except as set forth in Schedule  3.21,
there is no claim,  action or proceeding or investigation (i) pending or (ii) to
the knowledge of the Stockholders,  threatened against the Company or against or
relating to the properties, assets, business or operations of the Company before
any court, arbitrator or administrative, governmental or regulatory authority or
body. Except as set forth in Schedule 3.21, the Company is not contemplating the
institution  of  any  suit,   action,   arbitration,   administrative  or  other
proceeding.





<PAGE>



Except as set forth in Schedule 3.21, the Company is not subject to any material
order, writ, judgment,  injunction, decree, determination or award of any court,
arbitrator or administrative, governmental or regulatory authority or body.

         3.22 Transactions with Affiliates. Schedule 3.22 lists all arrangements
between either  Stockholder  (or any of its  Affiliates) and the Company for (i)
the provision of management,  accounting,  technical or other services, (ii) the
sale or lease of equipment,  office space or other assets or properties or (iii)
any other  arrangement  that is material to the business and  operations  of the
Company, including without limitation all compensation or other payments made or
to be made to any  employees  of the  Company  by the  Stockholders,  prior  to,
concurrently  with or  after  the  consummation  of the  Merger,  of any  nature
whatsoever.  Schedule 3.22 sets forth all of the  indebtedness,  liabilities  or
accounts  payable  owed  by the  Company  to  either  Stockholder  or any of its
Affiliates and all of the accounts payable from either Stockholder or any of its
Affiliates  to the Company as at November 30, 1996.  Except as  contemplated  by
Section 6.9, such indebtedness,  liabilities and accounts payable,  and any such
subsequently incurred  indebtedness,  liabilities and accounts payable otherwise
permitted to be incurred  hereunder,  are to be paid by the obligors  thereon in
the ordinary  course of business.  Except as  disclosed  on Schedule  3.22,  the
Company has not been involved in any business  arrangement or relationship  with
either  Stockholder  or any other  Affiliate  of the  Company,  and  neither the
Stockholders  nor any other Affiliate of the Company owns any property or right,
tangible or intangible of the Company.

         3.23  Brokers.  No broker,  finder or  investment  banker  (other  than
Hambrecht & Quist LLC and Sutter Securities, Incorporated, all of whose fees are
being paid for by the  Stockholders)  is entitled to any brokerage,  finder's or
other fee or commission in connection with the transactions contemplated by this
Agreement based upon arrangements made by or on behalf of either  Stockholder or
the Company.

         3.24 Investment  Purpose.  Each Stockholder  acknowledges that the TCGI
Common Stock being  acquired by it hereunder is not being  registered  under the
Securities Act based on an exemption from registration under Section 4(2) of the
Securities Act, in that the issuance of the TCGI Common Stock  constituting  the
Merger  Consideration  does not involve any public  offering.  Each  Stockholder
represents in any event that it is an "accredited  investor"  within the meaning
of Regulation D under the Securities Act, and is acquiring the TCGI Common Stock
solely  for the  purpose of  investment  and not with a view to, or for offer or
sale in connection with, any distribution thereof in any transaction which would
be in violation of the securities laws of the United States of America or any





<PAGE>



state thereof.

         3.25 Full  Disclosure.  No  representation  or warranty  made by either
Stockholder  in  this  Agreement  or  in  any  certificate,  document  or  other
instrument  furnished or to be furnished by either  Stockholder  pursuant hereto
contains or will contain any untrue  statement of a material  fact,  or omits or
will omit to state any material fact  required to make any  statement  contained
herein or therein not misleading.


SECTION 4           REPRESENTATIONS AND WARRANTIES OF TCGI AND SUB

         TCGI and Sub,  jointly  and  severally,  represent  and  warrant to the
Stockholders as follows:

         4.1 Organization, Standing, and Authority.

                  (a) TCGI is a corporation  duly organized,  validly  existing,
and in good  standing  under  the laws of the  State of  Delaware.  TCGI has all
requisite  power and  authority  to execute and deliver this  Agreement  and the
documents  contemplated hereby, and to perform and comply with all of the terms,
covenants,  and  conditions to be performed and complied with by TCGI  hereunder
and thereunder.

                  (b) Sub is a corporation duly organized, validly existing, and
in good standing under the laws of the State of Delaware.  Sub has all requisite
power and  authority to execute and deliver  this  Agreement  and the  documents
contemplated hereby, and to perform and comply with all of the terms, covenants,
and  conditions  to  be  performed  and  complied  with  by  Sub  hereunder  and
thereunder. Sub is a wholly-owned subsidiary of TCGI.

         4.2 Authorization and Binding Obligation. The execution,  delivery, and
performance of this  Agreement by TCGI and Sub have been duly  authorized by all
necessary actions on the part of TCGI and Sub, respectively.  This Agreement has
been duly  executed  and  delivered by TCGI and Sub and  constitutes  the legal,
valid, and binding obligation of each of TCGI and Sub, respectively, enforceable
against such party in accordance with its terms except as the  enforceability of
this  Agreement  may be  affected by  bankruptcy,  insolvency,  or similar  laws
affecting  creditors'  rights  generally  and  by  judicial  discretion  in  the
enforcement of equitable remedies.

         4.3 Authority to Issue the TCGI Common Stock.  The issuance of the TCGI
Common Stock  constituting the Merger  Consideration to the  Stockholders,  Neal
Karsten Blue and Pushpendra Mohta has been authorized,  or will be authorized as
of the Closing Date, by TCGI. Upon delivery to the Stockholders, Neal Karsten






<PAGE>



Blue  and  Pushpendra  Mohta  of  stock  certificates  constituting  the  Merger
Consideration  and delivery to TCGI of the Company Shares in accordance with the
terms hereof, the TCGI Common Stock  constituting the Merger  Consideration will
have been validly issued,  fully paid and  nonassessable  and will not have been
issued in violation of any  preemptive  right or, subject to the accuracy of the
representation  of the  Stockholders  set forth in Section 3.24,  any applicable
securities laws. The  Stockholders,  Neal Karsten Blue and Pushpendra Mohta will
receive as of the  Effective  Time good and valid title to the TCGI Common Stock
constituting  the Merger  Consideration,  free and clear of all Liens other than
such restrictions on transfer as may arise under state and/or federal securities
laws.

         4.4 No Conflict.  The  execution,  delivery and  performance by TCGI of
this Agreement do not:

                  (a)  violate or conflict with any term or provision of
the certificate of incorporation or bylaws (or other charter
documents) of TCGI or Sub;

                  (b)  except as would  not have a  material  adverse  effect on
TCGI's or Sub's  ability to consummate  the  transactions  contemplated  hereby,
conflict  with or violate any law,  rule,  regulation,  order,  writ,  judgment,
injunction, decree, determination or award applicable to TCGI or Sub;

                  (c)  except as would  not have a  material  adverse  effect on
TCGI's or Sub's  ability to consummate  the  transactions  contemplated  hereby,
result in any breach of, or constitute a default (or event which with the giving
of notice or lapse of time, or both,  would become a default)  under, or give to
others any rights of termination, amendment, acceleration or cancellation of, or
result in the creation of any Lien on any of the assets or properties of TCGI or
Sub pursuant  to, any note,  bond,  mortgage,  indenture,  contract,  agreement,
lease, license, permit, franchise or other instrument relating to such assets or
properties  to which  TCGI or Sub is a party or by which  any of such  assets or
properties is bound or affected;

                  (d)  result  in the  creation  of any Lien on the TCGI  Common
Stock constituting the Merger Consideration; or

                  (e)  except  for the  consent  required  under  the  HSR  Act,
referred  to in Section  6.4,  and as set forth on  Schedule  3.13,  require any
consent,  approval,  authorization  or  other  action  by,  or  filing  with  or
notification to, any governmental or regulatory authority or any other Person.

         4.5 Brokers. No broker,  finder or investment banker is entitled to any
brokerage, finder's or other fee or commission in connection with the





<PAGE>



transactions  contemplated by this Agreement based upon  arrangements made by or
on behalf of TCGI or Sub.

         4.6 Full Disclosure.  No representation or warranty made by TCGI or Sub
in this Agreement or in any certificate,  document or other instrument furnished
or to be furnished by TCGI or Sub pursuant  hereto  contains or will contain any
untrue statement of a material fact, or omits or will omit to state any material
fact required to make any statement contained herein or therein not misleading.

         4.7  SEC Reports.

         (a) TCGI has made  available  to the  Stockholders  a true and complete
copy of each report,  schedule,  registration  statement  and  definitive  proxy
statement  publicly filed by TCGI with the  Securities  and Exchange  Commission
(the  "SEC")  since  January 1, 1996 (as such  documents  have since the time of
their filing been amended, the "TCGI SEC Reports").

         (b) The TCGI SEC Reports,  including  without  limitation any financial
statements  or schedules  included  therein,  (i) were  prepared in all material
respects  in  accordance  with the  requirements  of the  Securities  Act or the
Securities  Exchange Act of 1934,  as amended,  as the case may be, and (ii) did
not at the time they were filed (or if amended or supplemented by a filing prior
to the date of this  Agreement,  then on the date of such  filing)  contain  any
untrue statement of a material fact or omit to state a material fact required to
be stated therein or necessary to make the statements  therein,  in the light of
the circumstances under which they were made, not misleading.


SECTION   5          CERTAIN COVENANTS PRIOR TO CLOSING

         The parties  hereto  covenant and agree that from and after the date of
this Agreement and until the Closing Date:

         5.1 Conduct of Business  Prior to the  Closing.  Except as set forth on
Schedule 5.1:

                  (a) Ordinary Course.  The Stockholders shall cause the Company
to be operated in the ordinary  course of business  consistent  (in all material
respects) with past practices (except where such conduct would conflict with the
following   covenants  or  with  the  Company's  other  obligations  under  this
Agreement).  Except as  expressly  permitted  by this  Agreement or as otherwise
approved  in writing by TCGI,  neither of the  Stockholders  will enter into any
agreement,  or cause or permit the Company to enter into any agreement,  that is
in conflict with the terms of this Agreement, and the Stockholders will use






<PAGE>



their commercially reasonable best efforts to preserve the current relationships
of the Company with its  principal  customers,  suppliers and other Persons with
which it has significant business relationships. TCGI and Sub hereby acknowledge
and agree that,  in the  ordinary  course of business,  the Company  experiences
customer   turnover,   and  that  failure  to  prevent  such  customer  turnover
consistent,  in all material  respects,  with past  historical  trends shall not
constitute a breach by the Stockholders or the Company of this Section 5.1(a) so
long as the  Stockholders  otherwise  used  commercially  reasonably  efforts to
retain such customers pursuant to the preceding sentence.  The Stockholders will
advise TCGI in writing  promptly  after learning of any change or condition that
could reasonably be expected to have a Material Adverse Effect.

                  (b) Compensation.  Except for an employee bonus plan for which
expense has been accrued in 1996 at the rate of $12,500 per month and which will
aggregate  $150,000 at December  31, 1996,  and which is to be  allocated  among
employees in such fashion as may be  determined  by the Chairman of the Board of
Directors of CERFnet, unless TCGI shall agree in writing, the Stockholders shall
not permit the Company:  (i) to increase or otherwise  change the rate or nature
of the  compensation  (including  wages,  salaries and bonuses) which is paid or
payable to any employee or independent contractor of the Company except pursuant
to existing  Employee  Benefit Plans,  Compensation  Arrangements  and practices
which have been disclosed to TCGI on or prior to the date hereof; (ii) to adopt,
enter or terminate any Employee Benefit Plan or Compensation Arrangement;  (iii)
to  make  material   amendments  to  any  existing   Employee  Benefit  Plan  or
Compensation  Arrangement  except to the extent  required by law or necessary to
preserve the nature of the  benefits  provided  under such plan or  arrangement;
(iv) to pay any benefit not provided under any existing  Employee  Benefit Plans
or Compensation  Arrangements;  (v) to enter into, renew or allow the renewal of
any employment or consulting  agreement or other  contract or  arrangement  with
respect to the performance of personal services for a term of more than one year
or requiring  the payment of more than $50,000 in annual  compensation;  (vi) to
voluntarily agree to enter into any collective  bargaining  agreement applicable
to any  employees  of the  Company  or  otherwise  recognize  any  union  as the
bargaining  representative  of any such  employees (and the  Stockholders  shall
promptly notify TCGI of any attempted or actual collective bargaining organizing
activity with respect to any such employees).

                  (c)  Indebtedness.  The  Stockholders  shall  not  permit  the
Company to (i) create, incur or assume any indebtedness for borrowed money, (ii)
mortgage,  pledge or otherwise  encumber any of its properties or assets,  (iii)
guarantee or endorse,  or otherwise as an accommodation  become responsible for,
the obligations of any Person, or (iv) make any loans or advances, create or





<PAGE>



assume any other  indebtedness,  except accounts  payable and other  liabilities
incurred in the ordinary course of business.

                  (d)  Capital  Stock.  The  Stockholders  shall not  permit the
Company or any of its  subsidiaries  to (i) except for (A) the  issuance  of the
replacement  certificates  described  in  Section  3.9(e),  issue any  shares of
capital stock of any class or grant any warrants, options or rights to subscribe
for any shares of capital stock of any class or securities  convertible  into or
exchangeable  for, or which otherwise confer on the holder any right to acquire,
any  shares  of  capital  stock of any  class;  (ii)  amend its  certificate  of
incorporation  or bylaws,  (iii)  except  with  respect to the  CERFnet  Germany
Dividend  to the  Stockholders  pursuant  to Section  6.9 and the  Section  6.12
Matters, split, combine or reclassify its outstanding capital stock, or declare,
set aside or pay any dividend or other  distribution  payable in cash,  stock or
property,  (iv) except for the  Section  6.12  Matters  and the CERFnet  Germany
Dividend,   declare,   set  aside  or  pay  any  dividends  or  make  any  other
distributions  in  respect  of any of  its  capital  stock  or (v)  directly  or
indirectly redeem, purchase or otherwise acquire or agree to redeem, purchase or
otherwise acquire any shares of capital stock of the Company.

                  (e) Contracts. The Stockholders shall (i) cause the Company to
comply in all material  respects with all terms and covenants and  conditions of
all service  contracts in accordance  with their  respective  terms and (ii) not
permit the Company,  except in the ordinary course of business, to modify, amend
or  terminate  any  material  contract or agreement to which it is a party or to
waive, release or assign any material rights or claims.

                  (f)  Certain   Payments.   Except  as   contemplated  by  this
Agreement,  the  Stockholders  shall  not  permit  the  Company  to (i) make any
payments to any of its Affiliates,  other than (A) trade payables,  (B) pursuant
to existing contracts, and (C) the payment of accrued income taxes to be paid by
an Affiliate  and other  amounts in the ordinary  course of business  consistent
with past practice or (ii) pay, discharge or satisfy any claims,  liabilities or
obligations (whether accrued,  asserted or unasserted,  contingent or otherwise)
other than in the ordinary course of business consistent with past practice.

                  (g) No Inconsistent  Action. The Stockholders shall not permit
the Company to take any action that is inconsistent  with its obligations  under
this  Agreement  or  that  could  hinder  or  delay  the   consummation  of  the
transactions contemplated by this Agreement.

         5.2 Access to Information. TCGI and its counsel, accountants,





<PAGE>



engineers, and other authorized  representatives shall have reasonable access to
the properties,  equipment, books, records, Contracts, and documents relating to
the Company for the purpose of audit and  inspection,  provided that such access
does not  unreasonably  interfere  with the normal  operation of the Company and
that all  requests  for access  shall be  directed  to John E.  Jones,  James R.
Edwards or such other  person as the  Company may  designate  from time to time.
TCGI and its representatives shall not contact any of the customers or suppliers
of the Company  without  the prior  consent of the  Company,  which shall not be
unreasonably  withheld or delayed.  The Stockholders  shall cause the Company to
cooperate in all reasonable respects with TCGI's examinations and investigations
and  will  furnish  or  cause  to  be  furnished  to  TCGI  or  its   authorized
representatives  all information with respect to the Company,  its properties or
the Company Shares that TCGI may reasonably request.

         5.3 Maintenance of Assets.  The Stockholders shall cause the Company to
maintain  all of its  properties  in good  condition  (ordinary  wear  and  tear
excepted) and use, operate,  and maintain all of such properties in a reasonable
manner,  consistent in all material  respects with past  practice.  If any loss,
damage,  impairment,  confiscation,  or  condemnation  of or to any of the  such
properties occurs, the Company shall repair,  replace or restore such properties
to their prior  condition as represented in this Agreement as soon thereafter as
possible,  and the  Company  shall (i) use the  proceeds  of any claim under any
insurance  policy  solely to repair,  replace or restore any of such  properties
that are lost,  damaged,  impaired or destroyed or (ii) retain such  proceeds in
the Company.

         5.4  Notification.  The  Stockholders  shall  promptly  notify  TCGI in
writing of any unusual or material  developments with respect to the business of
the Company,  and of any material change in any of the information  contained in
the Stockholders'  representations and warranties contained in Section 3 of this
Agreement.

         5.5 Cooperation.  Each of the parties hereto shall cooperate fully with
each other and their respective counsel and other  representatives in connection
with any action  required  to be taken as part of their  respective  obligations
under  this  Agreement  or as  may  otherwise  be  required  to  consummate  the
transactions  contemplated  hereby.  Each of the parties shall use  commercially
reasonable best efforts to consummate the transactions  contemplated hereby, and
shall execute and deliver such  documents and other papers and take such further
actions as may be reasonably required,  or as may be reasonably requested by the
other party,  in any case whether before or after the Closing,  to carry out the
provisions hereof and give effect to the transactions contemplated hereby.





<PAGE>



Neither  of the  parties  shall take any action  that is  inconsistent  with its
obligations under the Agreement.

         5.6  Financial  Reports.  Within twenty (20) days after the end of each
month through the Closing Date, the  Stockholders  will furnish TCGI with copies
of the  Company's  monthly  financial  reports  prepared  after the date  hereof
(including a balance sheet and operating  statement) for each such month and the
fiscal year to the end of such month. All of the foregoing financial  statements
shall comply with the requirements  concerning financial statements set forth in
Section 3.7.

         5.7  Certain   Contracts.   At  or  prior  to  the  Closing  Date,  the
Stockholders shall assign or cause to be assigned to the Company, all rights and
obligations  under any contract or agreement  identified on Schedule  3.12(a) or
Schedule 3.12(b) as a Contract (other than any such rights or obligations of the
Stockholders or their Affiliates  pursuant to Contracts entered into between the
Company and such Stockholder or any of its  Affiliates),  subject to Section 6.4
and to the extent not vested in the Company as of the date hereof.


SECTION   6            ADDITIONAL COVENANTS AND AGREEMENTS

         6.1  Confidentiality.  Each of TCGI and Sub  acknowledge  that  certain
Information (as defined in the Confidentiality  Agreement) provided to any of it
and its Affiliates,  agents and representatives by the Company, the Stockholders
and their  Affiliates,  agents and  representatives  is subject to the terms the
Confidentiality  Agreement,  the  terms  of which  are  hereby  incorporated  by
reference.  Effective  upon,  and only upon,  the Closing,  the  Confidentiality
Agreement shall terminate; provided, however, that each of the Stockholders, the
Company,  TCGI  and Sub  acknowledge  and  agree  that  any and all  Information
provided  or  made  available  to any  of it  and  its  Affiliates,  agents  and
representatives  by or on behalf of the Company,  other than (i) with respect to
TCGI and Sub,  Information  relating  primarily  to the Company or TCGI and (ii)
with  respect  to  the  Stockholders,  Information  relating  primarily  to  the
Stockholders,   shall  remain  subject  to  the  terms  and  conditions  of  the
Confidentiality  Agreement  after the Closing Date for a period ending three (3)
years from the date of the Confidentiality Agreement.

         6.2  Publicity.   All  general   notices,   releases,   statements  and
communications  to  employees,  suppliers,  distributors  and  customers  of the
Company and to the  general  public and the press  relating to the  transactions
covered by this Agreement shall be made by any of the  Stockholders,  on the one
hand, and TCGI, on the other, only at such times and in such manner as may be





<PAGE>



mutually agreed upon by TCGI and the Stockholders,  except as may be required by
any  applicable  law or  regulation  or pursuant to the rules of the NASD or any
securities exchange on which either party's securities are registered.

         6.3 Legend.

                  (a) TCGI shall place the following  legend on the certificates
evidencing the Merger Consideration:

THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE BEEN ACQUIRED FOR INVESTMENT
AND HAVE NOT BEEN REGISTERED  PURSUANT TO THE SECURITIES ACT OF 1933, AS AMENDED
(THE "ACT"), OR ANY APPLICABLE STATE STATUTES.  SUCH SECURITIES MAY NOT BE SOLD,
TRANSFERRED,  PLEDGED,  HYPOTHECATED,  OR  OTHERWISE  DISPOSED  OF UNLESS  (I) A
REGISTRATION  STATEMENT UNDER THE ACT OR APPLICABLE  STATE SECURITIES LAWS SHALL
HAVE  BECOME   EFFECTIVE  WITH  REGARD  THERETO,   OR  (II)  AN  EXEMPTION  FROM
REGISTRATION  EXISTS UNDER THE ACT (OR THE REGULATIONS  PROMULGATED  THEREUNDER)
AND APPLICABLE STATE SECURITIES LAWS AND SUCH EXEMPTION IS APPLICABLE THERETO.

TCGI may  refuse to  transfer  the TCGI  Common  Stock  constituting  the Merger
Consideration  on its  books  unless  and  until the  holders  thereof  meet the
requirements of the foregoing.

                  (b)  From  and  after  the time  when  restriction  on sale of
restricted  securities by Persons  receiving  TCGI Common Stock pursuant to this
Agreement who are not also "affiliates" of TCGI have terminated pursuant to Rule
144(k) under the Securities  Act, upon surrender to TCGI for such purpose of any
certificates  evidencing the Merger  Consideration and bearing such legend, TCGI
shall cause  replacement  certificates  not bearing  such legend with respect to
shares of TCGI Common Stock represented by such certificates to be issued to the
owner thereof.

         6.4  Regulatory and Other Authorizations; Consents.

                  (a) Each party  hereto  will use its  commercially  reasonable
best efforts to obtain all authorizations, consents, orders and approvals of all
federal, state and local regulatory bodies and officials and other third parties
that may be or become necessary for the performance of its obligations  pursuant
to this  Agreement  and will  cooperate  fully with the other  party in promptly
seeking to obtain all such authorizations, consents, orders and approvals.

                  (b) Each  party  hereto  agrees  to (a)  file,  or cause to be
filed, with the U.S.  Department of Justice ("DOJ") and Federal Trade Commission
("FTC")  all  filings  that are  required in  connection  with the  transactions







<PAGE>



contemplated hereby under the  Hart-Scott-Rodino  Antitrust  Improvements Act of
1976,  as amended (the "HSR Act") within ten (10)  business  days of the date of
this Agreement; (b) submit to the other party, prior to filing, their respective
HSR Act filings to be made hereunder, and to discuss with the other any comments
the reviewing  party may have; (c) cooperate with each other in connection  with
such HSR Act filings,  which cooperation shall include furnishing the other with
any information or documents that may be reasonably  required in connection with
such  filings;  (d)  promptly  file,  after any  request by the FTC or DOJ,  any
information or documents requested by the FTC or DOJ; and (e) furnish each other
with  any  correspondence  from  or to,  and  notify  each  other  of any  other
communications   with,  the  FTC  or  DOJ  that  relates  to  the   transactions
contemplated hereunder,  and to the extent practicable,  to permit each other to
participate in any conferences with the FTC or DOJ.

                  (c) Subject to the other  provisions  of this Section 6.4, the
parties  hereto will not take any action that will have the effect of  delaying,
impairing  or impeding the receipt of any  required  approvals or consents.  The
Stockholders  shall,  and  shall  cause the  Company  to,  use its  commercially
reasonable  best  efforts  to  assist  TCGI  in  obtaining  the  above-described
authorizations,  consents, orders and approvals,  including, without limitation,
those listed on Schedule 3.13, including,  without limitation,  making qualified
personnel available for attending hearings and meetings respecting such required
consents,   in  accordance  with  time  schedules  established  by  TCGI  acting
reasonably.

                  (d)  "Commercially  reasonable  best  efforts" as used in this
Section 6.4 shall not require the Stockholders, the Company or TCGI to undertake
extraordinary or unreasonable  measures to obtain any such consents,  including,
without limitation,  requiring the Stockholders, the Company or TCGI to make any
expenditures  (other  than  customary  filing fees or the like) or to accept any
changes  in the terms of the  contract,  license or other  instrument  for which
consent  is  sought.   It  shall  be  deemed  a  reasonable   measure  that  the
Stockholders, the Company or TCGI, as the case may be, shall correct or cure, at
its  expense,  prior to Closing,  any existing  violation  or default  under any
contract or instrument  for which a consent is sought if the  correction or cure
thereof is required by the  consenting  entity as a condition  to the grant of a
consent by such  contracting  entity,  unless the  Stockholders,  the Company or
TCGI,  as the case may be,  reasonably  believes  that it has a valid defense to
such assertions or violation or default.

                  (e) Without limiting the  applicability of any other provision
hereof,  TCGI  shall be  afforded  the  opportunity  by the  Stockholders  to be
materially and substantially involved in the process of obtaining required





<PAGE>



consents from governmental authorities or other third parties, including without
limitation  joint  participation  with the  Stockholders  in the analysis of the
correct  procedures to be followed to obtain such consent and in the initiation,
negotiation  and  prosecution  of  obtaining  such  consents  from  governmental
authorities or other third parties.

         6.5  Certain Tax Matters.

                  (a) "Booked  Taxes"  means Taxes of the Company  payable  with
respect to a Short  Period (as  defined in  Section  6.5(b)(i)  below)  that are
reflected  on the books and  records of the  Company as of the date on which the
Effective Time occurs.

                  (b) Taxes of the Company with respect to the period  ending on
(and  including) the date on which the Effective Time occurs,  other than Booked
Taxes, shall be the  responsibility of the Stockholders.  Taxes of the Surviving
Corporation  with  respect to the period  after the date on which the  Effective
Time occurs shall be the responsibility of TCGI.

                           (i)      The Stockholders, jointly and severally,
agree to pay and,  notwithstanding  any disclosure of potential tax  liabilities
made by the  Stockholders,  to  indemnify,  reimburse,  and  hold  harmless  the
Surviving  Corporation  and TCGI (and other members of the  affiliated  group of
which the  Surviving  Corporation  and TCGI are or will be  members  (the  "TCGI
Affiliated  Group") and their  successors  from and against any and all Taxes of
the  Company  payable  with  respect  to, and any and all  claims,  liabilities,
losses,  damages,  costs and expenses  (including without limitation court costs
and  reasonable  professional  fees  incurred in the  investigation,  defense or
settlement  of any claims  covered by this  indemnity)  (herein  referred  to as
"Indemnifiable Tax Damages"), arising out of or in any manner incident, relating
or  attributable to Taxes of the Company payable with respect to, or Tax Returns
required to be filed by the Company  under  Section  6.5(h) with respect to, (i)
any taxable year (or other applicable  reporting period) ("Reporting Period") of
the Company ending on or before the date on which the Effective Time occurs, and
(ii) any period  beginning on the first day of any Reporting  Period that is not
completed as of the date on which the  Effective  Time occurs and ending on (and
including) such date (a "Short Period"), whether such Taxes are imposed directly
on the  Company  or as a result of  including  the  Company in  consolidated  or
combined returns filed by the GA Affiliated  Group,  except that with respect to
any Short Period,  the Stockholders shall be responsible for the payment of such
Taxes only to the extent that they exceed Booked Taxes.  Such obligations of the
Stockholders  shall include without  limitation any payment of withholding taxes
related to the Incentive  Agreements.  The Stockholders shall be entitled to any






<PAGE>



credits or  refunds  of Taxes of the  Company  payable  with  respect to (A) any
Reporting  Period  of the  Company  ending  on or  before  the date on which the
Effective Time occurs, and (B) any Short Period.  TCGI shall cause the amount of
any credits or refunds of Taxes to which the  Stockholders  are  entitled  under
this  Section  6.5,  but which are  received  by or  credited  to the  Surviving
Corporation  or its  successors  after  the  Closing  Date,  to be  paid  to the
Stockholders  within ten business  days  following  such  receipt or  crediting,
provided that the Stockholders shall reimburse the Surviving  Corporation or its
successors to the extent of any required  subsequent  repayment of, or reduction
in, the amount of such credits or refunds of Taxes so received or  credited.  At
the reasonable request of the Stockholders, TCGI shall cause the Company, at the
sole  expense of the  Stockholders,  to  reasonably  cooperate  in the filing of
claims for refund of Taxes,  or amended  Tax  Returns,  allowing  the Company to
obtain the credits or refunds of Taxes to which the  Stockholders  are  entitled
under this Section 6.5.

                           (ii)  The Stockholders, jointly and severally,
shall also indemnify and hold harmless TCGI (and members of the TCGI  Affiliated
Group),  the Surviving  Corporation,  and their  respective  successors from and
against any and all Taxes of the Stockholders, CERFnet Germany and other members
of the GA  Affiliated  Group  other than the  Company  for any and all  periods,
whether  before or after the  Effective  Time,  and from and against any and all
Indemnifiable Tax Damages arising out of or in any manner incident,  relating or
attributable  to such Taxes or to Tax  Returns  filed or required to be filed by
the  Stockholders,  CERFnet Germany and other members of the GA Affiliated Group
other than the Company.

                           (iii)  TCGI agrees to pay and to indemnify,
reimburse  and hold  harmless the  Stockholders  and their  successors  from and
against  (i) any and all Booked  Taxes and (ii) any and all Taxes of the Company
payable with respect to, and any and all Indemnifiable Tax Damages,  arising out
of or in any manner  incident,  relating or attributable to Taxes of the Company
payable with respect to, or Tax Returns required to be filed by the Company with
respect to, (A) any Reporting Period of the Company  beginning after the date on
which the Effective Time occurs;  and (B) any Reporting Period that includes the
date on which the Effective Time occurs but only for that portion of such period
commencing the day after such date.

                  (c) Any tax  sharing  agreement,  practice,  or other  similar
arrangement  between the Company and  corporations or other entities  related to
the Company shall be terminated as to the Company as of the Closing Date.

                  (d) The Company has calculated its federal income tax





<PAGE>



liability  (or  credit for the Tax  benefits  of losses) as if it was a separate
unaffiliated corporation and makes payments to (or received credits from) Tenaya
Corporation accordingly.

                  (e) Except as  otherwise  provided in this  Section  6.5,  any
amounts  owed by the  Stockholders  to any party under this Section 6.5 shall be
paid within ten (10) business  days of notice from such party;  provided that if
such party has not paid such amounts and such amounts are being contested before
the appropriate  governmental  authorities in good faith, the Stockholders shall
not be required to make payment until it is determined finally by an appropriate
governmental  authority  or court  that  payment  is due.  Except  as  otherwise
provided in this  Section  6.5, any amounts owed by TCGI to any party under this
Section  6.5 shall be paid within ten  business  days of notice from such party;
provided that if such party has not paid such amounts and such amounts are being
contested before the appropriate governmental authorities in good faith, neither
TCGI nor the Company  shall be required to make payment  until it is  determined
finally by an appropriate  governmental  authority or court that payment is due.
Any  amounts  that are not paid within the period  provided in this  Section 6.5
shall accrue interest at the "Underpayment  Rate" under Section 6621 of the Code
for the underpayment of taxes by corporations.

                  (f) The Tax  liabilities for each Short Period for the Company
shall be  determined  by closing  the books and records of the Company as of the
date on which the Effective  Time occurs,  by treating each such Short Period as
if it were a separate  Reporting  Period,  and by employing  accounting  methods
which are  consistent  with those  employed in preparing the Tax Returns for the
Company  in  prior  Reporting  Periods  and  which do not  have  the  effect  of
distorting income or expenses (taking into account the transactions contemplated
by this Agreement),  except that Taxes based on items other than income or sales
shall be computed  for the  Reporting  Period  beginning on the first day of the
applicable  Short Period and  prorated on a time basis  between the Short Period
and the period  beginning on the first day after the date on which the Effective
Time occurs and ending on the last day of the  Reporting  Period which  includes
the Effective Time; provided that with respect to any Tax which is not in effect
during the entire Short Period,  the proration of such Tax shall be based on the
period  during the Short  Period that such Tax was in effect.  It is agreed that
any Tax liability arising out of the CERFnet Germany Dividend,  and any Taxes or
Tax  deductions  relating to the  Incentive  Agreements,  shall be allocated for
purposes of this Agreement to the period ending on or prior to the date on which
the Effective Time occurs.

                  (g) TCGI shall promptly notify the  Stockholders in writing of
any  notice,  letter,  correspondence,  claim,  determination,  decision





<PAGE>



or decree ("Tax Claim")  received by TCGI or the Surviving  Corporation or their
successors  relating  solely to any  Reporting  Period  ending on or before  the
Closing  Date  that  might  raise a claim  for  indemnification  hereunder.  The
Stockholders, at their cost and expense, shall have the sole and exclusive right
to (and shall  promptly  notify  TCGI as to  whether  or not they will)  handle,
answer,  defend,  compromise  or settle such Tax Claim and any tax  examination,
audit,  contest  or  litigation  in  connection  therewith;  provided  that  the
Stockholders  shall be responsible for the payment of any interest and penalties
resulting from any delay by the Stockholders in payment of the Tax Claim. If the
Stockholders  fail within a reasonable time after notice to defend or handle any
Tax Claim or any examination,  audit,  contest or litigation as provided herein,
the Stockholders shall be bound by the results obtained by TCGI or the Surviving
Corporation  in  connection  with such Tax Claim  and such  examination,  audit,
contest  or  litigation.  TCGI shall  cause the  Surviving  Corporation  to give
promptly to the Stockholders any relevant information relating to such Tax Claim
which may be particularly within the knowledge of the Surviving  Corporation and
otherwise to cooperate fully with the Stockholders in good faith with respect to
such Tax Claim. Notwithstanding the foregoing, the Stockholders shall not agree,
without the consent of TCGI (which consent shall not be unreasonably withheld or
delayed),  to any adjustment for any Reporting  Period ending on or prior to the
date on which the  Effective  Time occurs  which will  legally  bind TCGI or the
Surviving  Corporation  for any period after such date. TCGI shall have the sole
and exclusive right to handle,  answer,  defend,  compromise or settle Tax Claim
relating to taxable  years or periods  (including  such  period that  includes a
Short  Period)  ending  after  the  date on which  the  Effective  Time  occurs.
Notwithstanding the foregoing,  TCGI shall not agree, without the consent of the
Stockholders (which consent shall not be unreasonably  withheld or delayed),  to
any  adjustment for any period ending after the date on which the Effective Time
occurs  (including  such period that includes a Short Period) which will legally
bind the  Stockholders  or the Company for any period ending on or prior to such
date (including such period that includes a Short Period).

                  (h) The  Stockholders  shall be responsible  for preparing and
filing on behalf of the Company all Tax  Returns  for  Reporting  Periods of the
Company  ending  on or  before  the date on which  the  Effective  Time  occurs,
including  Tax Returns of the Company for such periods  which are due after such
date,  and the  Stockholders  shall  be  responsible  for the  contents  of such
returns;  provided,  however,  that the Stockholders  shall furnish TCGI and the
Company or its successors with copies of such returns of the Company (or, in the
case of consolidated or combined Tax Returns of the GA Affiliated Group,






<PAGE>



appropriate  portions  thereof),  within 30 days following the filing date. TCGI
shall be responsible for preparing and filing all Tax Returns of the Company and
the Surviving  Corporation for Reporting  Periods ending after the date on which
the Effective Time occurs  (including for Reporting Periods beginning before and
ending  after  such  date);  provided,  however,  that TCGI  shall  furnish  the
Stockholders  with copies of such returns to the extent they relate to Reporting
Periods  beginning  before and ending  after such date.  TCGI shall  provide the
Stockholders  with a  substantially  complete  draft  of each Tax  Return  for a
Reporting  Period  that  begins  before  and ends  after  the date on which  the
Effective  Time occurs a  reasonable  time prior to the filing of such  returns.
Stockholders  shall  have the right to comment  on such  returns  and TCGI shall
consider in good faith any such comments.

                  (i) If the  Company or a member of the TCGI  Affiliated  Group
has any  reduction in Tax  liability in any period  beginning  after the date on
which the  Effective  Time occurs by reason of an adjustment to the Taxes of the
Company or the GA  Affiliated  Group for any period  (including a Short  Period)
ending on or prior to the date on which the Effective  Time occurs that produces
a Tax detriment to the Stockholders,  the Company or the GA Consolidated  Group,
then TCGI shall pay to the Stockholders the lesser of (i) the amount of such Tax
detriment and (ii) the present  value,  as of the time payment is due under this
Section  6.5(i),  of such  reduction  in Tax  liability  (based on a good  faith
determination  by the  parties  as to the  value  and  timing  of such  amounts)
promptly after the amount payable under this Section 6.5(i) is determined.

                  (j) Each of the  parties  hereto  will  provide the other with
such assistance as may reasonably be requested by any of them in connection with
the  preparation of any Tax Return  (including  the periods ending  December 31,
1996 and as of the  Closing  Date and any amended Tax Returns and claims for Tax
refunds),  any audit or other examination by any Tax authority,  or any judicial
or  administrative  proceedings  relating to liability for Taxes,  and each will
retain until the expiration of any relevant statutes of limitations (and, to the
extent  notified by the other  party,  any  extension  thereof)  and provide the
other,  at all  reasonable  times,  with  any  work  papers,  records  or  other
information  which  may be  relevant  to  such  return,  audit  or  examination,
proceeding or determination (including, but not limited to, determinations under
this Section 6.5). The party requesting  assistance or documents hereunder shall
reimburse the other parties for reasonable  expenses  incurred in providing such
assistance  or  documents.  Within  ninety  days  after the  Closing  Date,  the
Stockholders  will assist TCGI in preparing a schedule setting forth (i) the tax
basis of the assets of the Company as of the date on which the Effective Time






<PAGE>



occurs and (ii) and consents or  elections  made under the Code or any state Tax
law by the Company or any member of the GA Affiliated  Group with respect to the
Company.

                  (k) It is the  intention  of the parties that the Merger shall
qualify as a tax-free  reorganization  under section 368(a) of the Code, and the
parties  agree that each shall report the  transaction  accordingly  for federal
income tax purposes. The parties further agree that each shall act in accordance
with that stated  intention of the parties.  Without  limiting the generality of
the foregoing, in a transaction pursuant to a current plan or intention of TCGI,
Sub or the Surviving Corporation or pursuant to a transaction that is integrated
with the Merger,  TCGI shall not, and shall cause its  Affiliates  not to, cause
the  Surviving  Corporation  to do any of the following in a manner which causes
the Merger to fail to qualify as a reorganization  within the meaning of Section
368(a) of the Code: (i) sell or otherwise  dispose of a material  portion of its
assets except for  dispositions  made in the ordinary  course of business,  (ii)
fail to continue in all material  respects the historic  business of the Company
or (iii)  merge with,  consolidate  with or  liquidate  into  another  entity or
otherwise fail to continue the Surviving Corporation as a corporate entity. TCGI
shall not, and shall cause its Affiliates not to, dispose of a material  portion
of the stock of the Surviving  Corporation either in a transaction pursuant to a
current plan or intention of TCGI, Sub or the Surviving  Corporation or pursuant
to a transaction  that is integrated  with the Merger,  in a manner which causes
the Merger to fail to qualify as a reorganization  within the meaning of Section
368(a) of the Code.  Each party  hereto  shall  notify the others if it receives
notice from any tax authority  that such tax  authority  asserts that the Merger
does not qualify as a tax-free  reorganization under section 368(a) of the Code.
The party  receiving  such  notice  shall  keep the other  party  advised of the
proceedings with respect to such dispute and shall advise the other party of the
final resolution thereof.

                  (l)   Notwithstanding   Section  10.1,  the   representations,
warranties,  and  covenants  contained  in Section  3.17 and in this Section 6.5
shall expire upon the expiration of the applicable  statute of limitations.  The
indemnification  provided  for in this  Section  6.5 shall not be subject to the
provisions  of  Section  10  and  shall   constitute  a  separate  and  distinct
indemnification obligation of the parties hereto.

         6.6  Certain Contracts.

                  (a) Pursuant to a Purchase  Order  between GA and the Company,
dated as of May 1, 1996, GA currently makes available to the Company, as partial
consideration for certain services provided to GA by the Company, a 10 Mb per






<PAGE>



second link for use as a backup line to the SDSC for the  Company's  facilities.
GA hereby  agrees  that such link shall  continue  to be made  available  to the
Company until December 31, 1997;  provided that if the backup line is terminated
to GA  prior  to that  date by a  third  party  over  whom  neither  Stockholder
exercises  control,  GA shall have no  responsibility  to furnish an alternative
line to the Company.

                  (b) Pursuant to that certain  Purchase Order (Contract  Number
ASC-8902825),  dated May 16,  1996,  between  the  Company  and GA, the  Company
provides certain Internet services to GA in its capacity as operator of the SDSC
for the period April 30, 1996 through  April 30, 1997.  GA agrees (i) to use its
best  efforts  to extend its  commitment  to  purchase  such  Internet  services
pursuant to such  Purchase  Order until  September  30, 1996,  on  substantially
similar terms and conditions as those provided  under such Purchase  Order;  and
(ii) to use reasonable  efforts to extend the commitment of the SDSC to purchase
such Internet services pursuant to such Purchase Order, on substantially similar
terms and conditions as those provided under such Purchase Order, from September
30, 1996 until the earlier of (A) the expiration of GA's term as operator of the
SDSC thereafter and (B) December 31, 1998,  solely to the extent that (X) GA has
the authority within the  requirements of any operating  contract or arrangement
between the  University of San Diego and GA to cause such extension and (Y) such
reasonable  efforts do not  conflict  with or violate any other  contractual  or
legal  restriction  applicable to GA, the University of San Diego,  the National
Science  Foundation  or the SDSC (it being  understood  that the  Company may be
required to  competitively  bid for the right to  continue  to provide  Internet
services during such extension period).  Notwithstanding  anything herein to the
contrary,  the  parties  hereto  acknowledge  and agree  that  failure  by GA to
negotiate  for or obtain (x) any such  authority  or (y) the removal of any such
contractual  or legal  restriction  shall in no case be deemed to be a breach or
violation of this Agreement.

         6.7 No  Solicitation of  Transactions.  None of the  Stockholders,  the
Company or its  subsidiaries,  directly  or  indirectly,  through  any  officer,
director,  agent or otherwise,  shall initiate,  solicit or knowingly  encourage
(including by way of furnishing  information or  assistance),  or take any other
action to facilitate knowingly, any inquiries or the making of any proposal that
constitutes,  or may  reasonably  be  expected  to  lead  to,  any  (i)  merger,
consolidation,   share  exchange,   business   combination,   or  other  similar
transaction  with  respect  to the  Company;  (ii) any  sale,  lease,  exchange,
mortgage,  pledge, transfer or other disposition of all or a substantial portion
of the assets of the Company,  in any transaction or series of transactions;  or
(iii) any public announcement of a proposal, plan or intention to do any of the






<PAGE>



foregoing or any agreement to engage in any of the foregoing  (each,  a "Company
Transaction"),  or enter into or maintain or continue  discussions  or negotiate
with any  Person  in  furtherance  of such  inquiries  or to  obtain  a  Company
Transaction,  or agree to or endorse any Company  Transaction,  or  authorize or
permit any of the  officers,  directors or employees of such party or any of its
subsidiaries or any investment banker, financial adviser,  attorney,  accountant
or  other  representative  retained  by  such  party  or  any  of  such  party's
subsidiaries to take any such action,  and each party shall promptly notify TCGI
of all of the relevant details relating to all proposals which it or any of such
party's subsidiaries or any such officer, director, employee, investment banker,
financial  adviser,  attorney,  accountant or other  representative  may receive
relating to any of such matters.

         6.8 Listing  Obligation.  From and after the time when the Stockholders
become eligible to sell the TCGI Common Stock issued hereunder  pursuant to Rule
144  under  the  Securities  Act,  TCGI  shall,   upon  written  notice  by  the
Stockholders  of their intent to sell such TCGI Common Stock in accordance  with
the  requirements  of Rule 144 under the Securities  Act, cause all of such TCGI
Common  Stock to be listed for trading on the NASDAQ or any such other  exchange
on which TCGI Common Stock is then listed for trading.

        6.9  CERFnet Germany.

                  (a) Not later  than one day  prior to the  Closing  Date,  the
Company shall declare and pay a dividend to GA and GATC of all of the issued and
outstanding  capital stock of CERFnet Germany (the "CERFnet Germany  Dividend"),
which  capital stock has a fair market value equal to the amount of the original
capital  contribution  made by the Company to CERFnet  Germany,  less all losses
incurred by CERFnet  Germany through the Closing Date (after taking into account
any tax benefit  relating  to such  losses).  Concurrently  with or prior to the
payment of such dividend,  GA or GATC shall (i) advance funds to CERFnet Germany
which shall be applied by it to repay any  outstanding  indebtedness  of CERFnet
Germany to the Company and (ii) assume or satisfy all obligations of the Company
with respect to CERFnet Germany including without limitation any liabilities and
obligations of the Company or otherwise  with respect to that certain  Guaranty,
dated as of  September  6,  1996,  by the  Company  in favor  of  Dresdner  Bank
Aktiengesellschaft  (such  transactions,  collectively  with the CERFnet Germany
Dividend, the "CERFnet Germany Transactions").

                  (b) As promptly as  practicable  after its  acquisition of the
Company's  interest in CERFnet  Germany,  but in no event later than twelve (12)
months after the Closing Date, GATC shall cause CERFnet Germany to change its






<PAGE>



name to delete the word  "CERFnet" and any word similar in sound,  appearance or
meaning to the word "CERFnet;"  provided;  however that the  Stockholders  shall
cause CERFnet Germany to use reasonable efforts to minimize its use of "CERFnet"
and such service marks as soon as possible after the Closing Date.  Beginning on
the date  referred to in Section  6.9(a) and ending on a date twelve (12) months
after  the  Closing  Date,  the  Company  hereby  grants  to  CERFnet  Germany a
non-exclusive  royalty-free  license to use the name  "CERFnet"  and each of the
service marks  identified  on Schedule 3.14 in connection  with the provision of
Internet  services by CERFnet  Germany.  The  Stockholders  shall cause  CERFnet
Germany to use "CERFnet" and each such service mark only in a manner  consistent
with the Company's prior use of "CERFnet" and such service marks.

         6.10  Guaranty of Accounts Receivable.

                  (a)  Guaranty.

                           (1)  GA and GATC hereby, jointly and severally,
guaranty the full,  complete and timely receipt by the Company of each and every
account  receivable  of  the  Company  existing  as of  the  Closing  Date  (the
"Receivables"), subject to the aggregate amount of the reserve for uncollectible
accounts reflected in the amount of Working Capital determined under Section 2.9
(the "Net  Receivables").  If, upon the completion of the Collection Period, the
amount collected by the Company with respect to the Receivables is less than the
amount of the Net Receivables,  then GA and GATC will provide payment in cash to
the  Surviving  Corporation  in an  amount  equal to the  entire  amount of such
shortfall  within  five (5)  business  days after  receipt  of notice  from TCGI
specifying the amount of such shortfall,  in accordance with Section 6.10(b)(2).
TCGI or the Surviving  Corporation  may proceed to enforce its rights against GA
and GATC  from  time to time  prior  to,  contemporaneously  with or  after  any
enforcement against the obligors with respect to any Receivable,  or without any
enforcement  against such  obligors.  The  obligations of GA and GATC under this
Section 6.10 shall be absolute and  unconditional and shall remain in full force
and effect without regard to and shall not be released, discharged or in any way
affected  by  (i)  any  amendment  or  modification  of or  supplement  to  this
Agreement,  (ii) any  exercise or  non-exercise  of or delay in  exercising  any
right, remedy,  power or privilege under or in respect of this Agreement,  (iii)
any bankruptcy, insolvency, arrangement, composition, assignment for the benefit
of creditors or similar  proceeding  commenced by or against  either GA or GATC,
(iv) the genuineness,  validity, or enforceability of this Agreement, or (v) any
other  circumstances  which  might  otherwise  constitute  a legal or  equitable
discharge of a guarantor or surety.

                           (2)  Each of GA and GATC waives presentment,
protest, demand or action or delinquency in respect of any of the obligations of





<PAGE>



GA and GATC under this Section 6.10. Each of GA and GATC waives all set-offs and
counterclaims and all notices of nonperformance,  notices of protest, notices of
dishonor, and notices of acceptance of this guaranty.

                           (3)  This guaranty shall be deemed a continuing
guaranty, and the above consents and waivers of GA and GATC shall remain in full
force and effect until the receipt by TCGI or the Surviving  Corporation in full
of the entire amount of the Net Receivables.

                  (b)  Collection.

                           (1)  From and after the Closing Date for a period
of six (6) months (the  "Collection  Period"),  TCGI shall  cause the  Surviving
Corporation to use  commercially  reasonable  best efforts to collect all of the
Receivables.  Except with  respect to amounts  received  pursuant to a Permitted
Settlement,  if the Surviving Corporation receives monies from an account debtor
of the Surviving Corporation that was also an account debtor of the Company with
respect to any of the Receivables,  the Surviving  Corporation  shall credit the
sums  received  to the  oldest  account  due.  In the event  that the  Surviving
Corporation  shall  collect  any monies  pursuant  to a  settlement  of accounts
receivable  (including any Receivables)  with any account debtor,  to the extent
that the amount of  Receivables  with respect to such account  debtor  involve a
bona fide dispute based on (i) the failure of the Company to provide  service to
such  account  debtor or (ii) an error by the  Company  in the  billing  of such
account  debtor (a  "Permitted  Settlement"),  the  proceeds  of such  Permitted
Settlement  shall be allocated  between the Receivables and accounts  receivable
accruing from and after the Closing Date in an equitable  fashion based upon the
particular facts involved.

                           (2)  If, as of the termination of the Collection
Period,  the  amount of  Receivables  collected  by the  Surviving  Corporation,
pursuant to Section  6.10(b)(1)  is less than the Net  Receivables,  TCGI or the
Surviving  Corporation  may demand from GA and GATC the amount of such shortfall
by providing  written notice to GA or GATC, which notice shall include a listing
of all the Receivables which remain uncollected.

                           (3)  From and after the date of the notice
specified in Section 6.10(b)(2),  TCGI shall cause the Surviving  Corporation to
continue  to use  commercially  reasonable  best  efforts to collect  all of the
Receivables;  provided,  however, that, at the request of the Stockholders,  the
Surviving Corporation shall assign to the Stockholders  uncollected  Receivables
in the amount  demanded  for  payment by TCGI  pursuant  to Section  6.10(b)(2).
Following any such assignment,  the Stockholders may use commercially reasonable






<PAGE>



best efforts to collect any amounts owed by the account  debtors with respect to
such Receivables so assigned.  Except with respect to amounts received  pursuant
to a Permitted Settlement,  if the Surviving Corporation receives monies from an
account debtor of the Surviving  Corporation  that was also an account debtor of
the Company with respect to any of the  Receivables,  the Surviving  Corporation
shall credit the sums  received to the oldest  account due.  During such period,
within ten (10) business days after  collecting  any amounts with respect to any
of the Receivables, the Surviving Corporation shall remit any such amounts to GA
or GATC.

         6.11 Payments Related to the Incentive  Agreements.  At or prior to the
Effective  Time,  (i) the  Stockholders  will cause the requisite cash and stock
payments to be made under the  Incentive  Agreements  and will pay the  required
amounts of payroll and withholding  taxes related thereto;  and (ii) the Company
will pay to Tenaya  Corporation  any unpaid balance of the amount of federal and
California  income tax  accrued by the  Company as of  December  31,  1996 (such
payment to Tenaya, the "Tenaya Payment");  provided, however, that, in the event
that Tenaya  Corporation  is determined to have received  payment for Taxes with
respect  to the  Company  for the 1996 tax year in excess of the amount of Taxes
which the Company would have been obligated to pay to taxing  authorities had it
paid such Taxes on its own behalf  (assuming a federal  income tax rate of 35%),
then the  Stockholders  shall,  consistent  with the  provisions of Section 6.5,
cause Tenaya Corporation to repay to the Surviving Corporation the excess of the
amount received by Tenaya  Corporation with respect to 1996 Taxes of the Company
over the amount of Taxes which would have been  properly  payable by the Company
had it paid such taxes on its own behalf  (assuming a federal income tax rate of
35%).

         6.12  Certain  Stockholder  Obligations.  The  Stockholders  have  full
responsibility  to pay  or  provide  for  the  payment  of  all  cash  payments,
deliveries  of  shares,  withholding  and  payroll  taxes  under  the  Incentive
Agreements and shall be entitled to all direct and indirect  income tax benefits
arising by reason of the fulfillment by them of such obligations,  including the
right to claim  resulting  deductions on income tax returns of the GA Affiliated
Group,  and  the  right  to  assignment  without  further  consideration  of any
receivables  from  participants  in the GA  Affiliated  Group  arising  from the
utilization of such deductions.


SECTION   7           CONDITIONS TO CLOSING

         7.1 Conditions to Obligations of TCGI. All  obligations of TCGI and Sub
at the Closing are subject to the fulfillment prior to or at the Closing Date of






<PAGE>



each of the  following  conditions  (subject  to the  ability of TCGI and Sub to
waive any such condition):

                  (a)  Representations  and Warranties.  All representations and
warranties of each of the Stockholders contained in this Agreement shall be true
and  complete in all  material  respects at and as of the Closing Date as though
made at and as of that time,  except to the extent that any such  representation
or warranty is made as of a specified date, in which case such representation or
warranty  shall have been true and complete in all material  respects as of such
date;

                  (b) Covenants and Conditions.  Each of the Stockholders  shall
have  performed  and  complied  in all  material  respects  with all  covenants,
agreements,  and  conditions  required  by this  Agreement  to be  performed  or
complied with by it prior to or on the Closing Date;

                  (c) HSR Act. Any waiting  period (and any  extension  thereof)
under the HSR Act applicable to the transactions  contemplated hereby shall have
expired or shall have been terminated,  and no action shall have been instituted
by  any  governmental  authority  with  jurisdiction  over  the  enforcement  of
antitrust  laws  challenging  or  seeking  to  enjoin  the  consummation  of the
transactions  contemplated under this Agreement which such action shall not have
been withdrawn or terminated;

                  (d) Consents.  All Consents set forth on Schedule 7.1(d) shall
have been obtained;

                  (e) No Order, Decree,  Injunction.  Neither TCGI nor Sub shall
be subject on the Closing Date to any order,  decree or injunction of a court of
competent  jurisdiction  which  enjoins or  prohibits  the  consummation  of the
transactions  contemplated  by  this  Agreement  or  compel  TCGI  or any of its
Affiliates  to dispose of or hold  separate a material  portion of its assets in
relation to the value of the Company Shares being acquired hereunder as a result
of the consummation of the transactions contemplated hereby;

                  (f) No Material Litigation.  There shall not be pending on the
Closing Date any  lawsuit,  claim or legal  action  involving  TCGI or Sub which
could  reasonably be expected to materially and adversely  affect the ability of
TCGI or Sub to perform their obligations hereunder;

                  (g) Employment  Contracts.  The employment  agreement,  by and
between the Company and  Pushpendra  Mohta,  entered into as of the date of this
Agreement,  shall remain in full force and effect  (excluding  the effect of any
breach by TCGI);






<PAGE>



                  (h)  Incentive  Compensation  Arrangements.  The  Stockholders
shall have paid or made  arrangements  for the payment of the  aggregate  of all
withholding  obligations  with  respect  to the  payments  under  the  Incentive
Agreements and related  payroll taxes or any other tax obligations of any nature
whatsoever relating thereto;

                  (i)  CERFnet   Germany   Dividend.   The  Company  shall  have
consummated the CERFnet Germany Dividend, in accordance with Section 6.9 hereof;

                  (j) Preliminary  Settlement Statement.  The Stockholders shall
have  delivered to TCGI a preliminary  settlement  statement  regarding  Working
Capital, as described in Section 2.9(b);

                  (k) Deliveries.  Each of the  Stockholders  shall have made or
stand willing to make all the deliveries to TCGI set forth in Section 8.1; and

                  (l) No  Material  Adverse  Effect.  Between  the  date of this
Agreement  and the  Closing  Date,  there  shall have been no  Material  Adverse
Effect.

         7.2 Conditions to Obligations of the Stockholders and the Company.  All
obligations  of the  Stockholders  and the Company at the Closing are subject to
the  fulfillment  prior  to or at the  Closing  Date of  each  of the  following
conditions  (subject  to the  ability  of the  Stockholders  to  waive  any such
condition):

                  (a)  Representations  and Warranties.  All representations and
warranties  of TCGI  and Sub  contained  in this  Agreement  shall  be true  and
complete in all  material  respects at and as of the Closing Date as though made
at and as of that time,  except to the extent  that any such  representation  or
warranty is made as of a specified  date, in which case such  representation  or
warranty  shall have been true and complete in all material  respects as of such
date;

                  (b) Covenants and  Conditions.  TCGI shall have  performed and
complied in all material respects with all covenants, agreements, and conditions
required by this Agreement to be performed or complied with by it prior to or on
the Closing Date.

                  (c) HSR Act. Any waiting  period (and any  extension  thereof)
under the HSR Act applicable to the transactions  contemplated hereby shall have
expired or shall have been terminated,  and no action shall have been instituted
by  any  governmental  authority  with  jurisdiction  over  the  enforcement  of
antitrust laws challenging or seeking to enjoin the consummation of the





<PAGE>



transactions contemplated under this Agreement which such action shall not have 
been withdrawn or terminated;

                  (d) No Order, Decree,  Injunction.  None of the Company or the
Stockholders  shall be  subject  on the  Closing  Date to any  order,  decree or
injunction of a court of competent  jurisdiction  which enjoins or prohibits the
consummation of the transactions contemplated by this Agreement;

                  (e) No Material Litigation.  There shall not be pending on the
Closing Date any lawsuit,  claim or legal action  involving the  Stockholders or
the  Company  which might  materially  and  adversely  affect the ability of the
Stockholders to perform their obligations hereunder;

                  (f) No Material Adverse Change or Effect.  Between the date of
this Agreement and the Closing Date, there shall have been no materially adverse
change in, or materially  adverse  effect on, the business,  assets,  results of
operations or financial condition of TCGI; and

                  (g) Deliveries.  TCGI shall have made or stand willing to make
all the deliveries set forth in Section 8.2.


SECTION   8                CLOSING DELIVERIES

         8.1 Deliveries by the Stockholders and the Company.  Prior to or on the
Closing  Date,  the  Stockholders  and the  Company  shall  deliver  to TCGI the
following,  in form  and  substance  reasonably  satisfactory  to  TCGI  and its
counsel:

                  (a) Certificates.  Stock certificates  representing all of the
Company  Shares,  duly  endorsed  by  each  Stockholder,  Neal  Karsten  Blue or
Pushpendra  Mohta or accompanied by stock transfer  powers duly executed by such
Stockholder,  Neal Karsten Blue or Pushpendra Mohta in blank, in proper form for
the transfer of the Company Shares to TCGI, free and clear of all liens, claims,
encumbrances or other interest whatsoever;

                  (b)  Consents.  A  manually  executed  copy of any  instrument
evidencing  receipt of the Consents set forth in Schedule  7.1(e) that have been
obtained by the Company or either Stockholder;

                  (c)  Officer's  Certificate.  A  certificate,  dated as of the
Closing Date, executed on behalf of each Stockholder and by each of Neal Karsten
Blue  and  Pushpendra  Mohta,   certifying  (1)  that  the  representations  and
warranties  of each such  Stockholder  contained in this  Agreement are true and
complete in all material respects as of the Closing Date as though made on and






<PAGE>



as of that date except to the extent that any such representation or warranty is
made as of a specified date, in which case such representation or warranty shall
have been true and  complete in all material  respects as of such date;  and (2)
that each such Stockholder has in all material  respects  performed and complied
with  all of its  obligations,  covenants,  and  agreements  set  forth  in this
Agreement to be performed and complied with on or prior to the Closing Date;

                  (d)  Resolutions.   A  certified  copy  of  the  duly  adopted
resolutions  of the board of directors of each  Stockholder  and of the board of
directors and stockholders of the Company,  authorizing the execution,  delivery
and  performance of this Agreement and all other actions taken or to be taken by
such party in connection with this Agreement, which resolutions shall be in full
force and effect as of the Closing Date.

                  (e) Good Standing Certificates.  Evidence of the good standing
of the Company, certified by the Secretary of State of the State of Delaware;

                  (f) Tax, Lien, and Judgment Searches.  Results of a search for
tax, lien, and judgment  filings in the records of San Diego County,  California
and the State of  California,  such  searches  having been made no earlier  than
twenty days prior to the Closing Date;

                  (g) Registration  Rights  Agreement.  The Registration  Rights
Agreement, duly executed by each holder of Company Shares;

                  (h) Minute  Books,  etc. The  complete  and correct  corporate
minute  books,  stock  transfer  ledger  and  other  corporate  records  and the
corporate seal of the Company;

                  (i) Opinions.  A legal opinion,  dated as of the Closing Date,
of each of (i)  Winthrop,  Stimson,  Putnam &  Roberts,  special  counsel to the
Company and the Stockholders,  and (ii) James R. Edwards, General Counsel to the
Stockholders, in form and substance reasonably satisfactory to TCGI and Sub; and

                  (j)  Other  Instruments.  All other  documents,  certificates,
instruments and writings required  hereunder to be delivered by the Stockholders
or the  Company  or as may be  reasonably  requested  by TCGI at or prior to the
Closing  Date,  all  such  documents  to be in  form  and  substance  reasonably
satisfactory to TCGI.

         8.2  Deliveries by TCGI.  Prior to or on the Closing  Date,  TCGI shall
deliver to the  Stockholders  the  following,  in form and substance  reasonably
satisfactory to the Stockholders and their counsel:





<PAGE>




                  (a) Merger Consideration.  Stock certificates representing the
Merger Consideration,  registered in the name of the Stockholders,  Neal Karsten
Blue and Pushpendra Mohta in accordance with the provisions of Section 2.8;

                  (b)  Officer's  Certificate.  A  certificate,  dated as of the
Closing Date, executed on behalf of TCGI certifying (1) that the representations
and  warranties of TCGI contained in this Agreement are true and complete in all
material  respects as of the Closing  Date as though made on and as of that date
except to the extent  that any such  representation  or warranty is made as of a
specified  date, in which case such  representation  or warranty shall have been
true and  complete in all material  respects as of such date,  and (2) that TCGI
has in all material respects performed and complied with all of its obligations,
covenants,  and  agreements  set forth in this  Agreement  to be  performed  and
complied with on or prior to the Closing Date;

                  (c) Registration  Rights  Agreement.  The Registration  Rights
Agreement, duly executed by TCGI;

                  (d) Legal Opinion.  A legal  opinion,  dated as of the Closing
Date,  of W.  Terrell  Wingfield,  Jr.  General  Counsel  to  TCGI,  in form and
substance reasonably satisfactory to the Stockholders;

                  (f)  Consents.  A  manually  executed  copy of any  instrument
evidencing  receipt of the Consents set forth on Schedule  7.1(e) that have been
obtained by TCGI;

                  (g)  Resolutions.   A  certified  copy  of  the  duly  adopted
resolutions  of the  board  of  directors  of  TCGI or the  Executive  Committee
thereof,  and of the board of directors and stockholder of Sub,  authorizing the
execution,  delivery and  performance  of this  Agreement  and the  Registration
Rights  Agreement  and all other  actions  taken or to be taken by such party in
connection with this  Agreement,  which  resolutions  shall be in full force and
effect as of the Closing Date; and

                  (h)  Other  Instruments.  All other  documents,  certificates,
instruments and writings required hereunder to be delivered by TCGI or as may be
reasonably  requested by the  Stockholders  at or prior to the Closing Date, all
such  documents  to be in form  and  substance  reasonably  satisfactory  to the
Stockholders.

SECTION    9              TERMINATION

         9.1 Termination by the  Stockholders.  This Agreement may be terminated
by the Stockholders and the transactions  contemplated hereby abandoned,  if the
Stockholders are not then in material default of their representations,





<PAGE>



warranties, covenants or agreements contained in this  Agreement,  upon written 
notice to TCGI,  upon the occurrence of any of the following:

                  (a)  Conditions.  If on the date that would  otherwise  be the
Closing  Date  any  of  the  conditions  precedent  to  the  obligations  of the
Stockholders and the Company set forth in Section 7.2 of this Agreement have not
been  satisfied  or waived by the  Stockholders,  unless  satisfaction  has been
frustrated or made impossible by an act or failure to act of the Stockholders or
the Company in breach or violation of its  covenants,  agreements or obligations
hereunder.

                  (b) Breach. If TCGI or Sub shall breach or fail to comply with
any of their representations,  warranties,  covenants or agreements contained in
this Agreement, or any such representation or warranty shall have become untrue,
in any such case such that the  conditions  precedent to the  obligations of the
Stockholders  and the Company to close  specified in Section  7.2(a) or (b) will
not be satisfied.

         9.2  Termination by TCGI.  This Agreement may be terminated by TCGI and
the transactions  contemplated hereby abandoned, if TCGI is not then in material
default of its representations, warranties, covenants or agreements contained in
this Agreement, upon written notice to the Stockholders,  upon the occurrence of
any of the following:

                  (a)  Conditions.  If on the date that would  otherwise  be the
Closing  Date any of the  conditions  precedent to the  obligations  of TCGI set
forth in this  Agreement  have not been  satisfied  or  waived  by TCGI,  unless
satisfaction  has been frustrated or made impossible by an act or failure to act
of  TCGI  or  Sub  in  breach  or  violation  of its  covenants,  agreements  or
obligations hereunder.

                  (b) Breach. If the Stockholders or the Company shall breach or
fail to  comply  with any of their  representations,  warranties,  covenants  or
agreements  contained in this Agreement,  or any such representation or warranty
shall have become untrue, in any such case such that the conditions precedent to
the obligation of TCGI and Sub to close  specified in Section 7.1(a) or (b) will
not be satisfied.

         9.3 Rights on Termination.  If this Agreement is terminated pursuant to
Section 9.1 or Section 9.2 and none of the parties is in material  breach of any
provision  of this  Agreement,  the  parties  hereto  shall not have any further
liability to each other with respect to this Agreement and (i) TCGI shall return
or destroy all documents and copies and other materials of a proprietary nature






<PAGE>



received  by it or its  representatives  from or on behalf of the Company or the
Stockholders  relating  to the  transactions  contemplated  hereby,  whether  so
obtained  before or after the  execution  hereof,  to the  Company  and (ii) all
Information (as defined in the  Confidentiality  Agreement)  received by TCGI or
its  representatives  with respect to the Company and the Stockholders  shall be
treated in accordance with the Confidentiality  Agreement, which shall remain in
full  force and  effect in  accordance  with its terms for a period of three (3)
years  from  the  date of the  Confidentiality  Agreement,  notwithstanding  the
termination  of  this  Agreement.   If  this  Agreement  is  terminated  by  the
Stockholders  due to TCGI's material breach of this Agreement,  the Stockholders
and the Company  shall have all rights and remedies  available at law or equity.
If this Agreement is terminated by TCGI due to the Stockholders' material breach
of any  provision  of this  Agreement,  TCGI and Sub shall  have all  rights and
remedies available at law or equity.


SECTION   10        SURVIVAL OF REPRESENTATIONS AND WARRANTIES;
                       INDEMNIFICATION; CERTAIN REMEDIES

         10.1  Representations  and  Warranties.  All  of  the  representations,
warranties,  covenants and agreements of the parties contained in this Agreement
shall  survive (and not be affected in any respect by) the  consummation  of the
transactions  contemplated  hereby and any investigation  conducted by any party
hereto and any  information  which any party may receive for a period  ending on
the  first  anniversary  of the  Closing  Date;  provided,  however,  that  such
limitation shall not apply to (i) the representations  and warranties  contained
in Section 3.17 and 3.20 and the covenants contained in Section 6.5, which shall
continue to survive for the applicable  statute of  limitations  periods and the
representations and warranties set forth in Sections 3.5, 3.23, 4.3 and 4.5, all
of which shall continue to survive indefinitely.

         10.2 Indemnification by TCGI. Subject to the other terms and conditions
of this Agreement, TCGI and Sub shall, jointly and severally,  indemnify each of
the  Stockholders,   the  Company  and  their  respective  officers,  directors,
employees and agents,  against and hold such Persons  harmless from all demands,
claims,  losses,  costs, fines,  liabilities,  damages (excluding  consequential
damages),  including  reasonable fees and expenses incurred in the investigation
and defense of claims and actions whether such claims and actions are brought by
third parties or either party hereto  (collectively,  "Losses"),  arising out of
the  breach of any  representation,  warranty,  covenant  or  agreement  of TCGI
herein.

         10.3  Indemnification  by the Stockholders.  Subject to the other terms
and conditions of this Agreement, the Stockholders shall, jointly and severally,





<PAGE>



indemnify  TCGI, Sub and their  respective  officers,  directors,  employees and
agents,  against and hold such Persons  harmless from all Losses  arising out of
the  breach  of any  representation,  warranty,  covenant  or  agreement  of the
Stockholders herein.

         10.4 Claims. If any claim or assertion of liability is made or asserted
against a party  entitled  to be  indemnified  pursuant  to this  Section 10 (an
"Indemnified  Party") by any Person  who is not a party to this  Agreement,  the
Indemnified Party shall give to the other party (an "Indemnifying Party") prompt
written notice in reasonable detail of such claim or assertion,  or of any event
or  proceeding  by or in  respect  of a third  party of which it has  knowledge,
concerning  any  liability or damage as to which it may request  indemnification
hereunder. The failure by an Indemnified Party to give notice on a timely basis,
as provided in this Section 10 shall not relieve the  Indemnifying  Party of its
obligations  under this Section except to the extent that the failure results in
a failure of actual notice to the Indemnifying  Party and the Indemnifying Party
is  damaged or  prejudiced  solely as a result of the  failure  to give  notice.
Thereafter,  the Indemnified  Party shall deliver  promptly to the  Indemnifying
Party copies of all notices and documents  (including  court papers) received by
the Indemnified Party relating to the third-party  claim. The Indemnifying Party
shall have the right to direct, through counsel chosen by the Indemnifying Party
and reasonably  satisfactory to the Indemnified Party, the defense or settlement
of any  such  claim  or  proceeding  at  its  own  expense;  provided  that  the
Indemnifying  Party  shall not have the right to control the defense of any such
claim or  proceeding  unless it has  acknowledged  in writing its  obligation to
indemnify the Indemnified Party fully from all liabilities  incurred as a result
of such  claim  or  proceeding  (subject,  however,  to  Section  10.5).  If the
Indemnifying Party elects to assume the defense of any such claim or proceeding,
the  Indemnified  Party may  participate  in such defense,  but in such case the
expenses  of the  Indemnified  Party  shall  be paid by the  Indemnified  Party;
provided,  however,  that if the  Indemnified  Party asserts that there exists a
conflict of interest  that would make it  inappropriate  for the same counsel to
represent the Indemnifying  Party and the Indemnified  Party and the counsel for
the Indemnifying Party concurs with such assertion,  then the Indemnifying Party
shall  reimburse the  Indemnified  Party for the reasonable fees and expenses of
separate  counsel.  The Indemnified  Party shall provide the Indemnifying  Party
with access to its records and personnel relating to any such claim,  assertion,
event or proceeding  during normal business hours and shall otherwise  cooperate
with the  Indemnifying  Party in the  defense  or  settlement  thereof,  and the
Indemnifying  Party shall reimburse the Indemnified Party for all its reasonable
out-of-pocket expenses in connection therewith. If the Indemnifying Party





<PAGE>



elects to direct the defense of any such claim or  proceeding,  the  Indemnified
Party  shall  not pay,  or  permit  to be paid,  any part of any claim or demand
arising from such asserted liability,  unless the Indemnifying Party, subject to
the  penultimate  sentence of this Section 10.4,  withdraws  from the defense of
such asserted liability,  or unless a final judgment from which no appeal may be
taken  by or on  behalf  of  the  Indemnifying  Party  is  entered  against  the
Indemnified Party for such liability. If the Indemnifying Party fails to defend,
or if, after commencing or undertaking any such defense,  the Indemnifying Party
fails to prosecute or withdraws from such defense,  the Indemnified  Party shall
have  the  right  to  undertake  the  defense  or  settlement  thereof,  at  the
Indemnifying  Party's expense.  If the Indemnified  Party assumes the defense of
any such claim or  proceeding  pursuant  to this  Section  10.4 and  proposes to
settle such claim or proceeding  prior to a final judgment  thereon or to forego
appeal  with  respect  thereto,  then  the  Indemnified  Party  shall  give  the
Indemnifying  Party prompt  written notice  thereof and the  Indemnifying  Party
shall have the right to  participate in the settlement or assume or reassume the
defense of such claim or proceeding. The Indemnifying Party shall not settle any
claim or assertion,  unless the  Indemnified  Party  consents in writing to such
settlement, which consent shall not be unreasonably withheld.

         10.3 Certain Limitations on Indemnification.

                  (a) The  Stockholders  shall have no liability  under  Section
10.3  unless  the  aggregate  of all  Losses  relating  thereto  for  which  the
Stockholders  would,  but for this provision,  be liable exceeds on a cumulative
basis an amount equal to fifty thousand dollars ($50,000). If such Losses exceed
fifty  thousand  dollars  ($50,000),  the  Stockholders  shall  be  required  to
indemnify TCGI and Sub for the full amount of such Losses,  subject to the other
limitations of this Section 10.

                  (b) The  Stockholders  shall  not  have  any  liability  under
Section  10.3 for any  individual  item where the Loss  relating to such item is
less than $5,000.

                  (c) The aggregate  liability of the Stockholders under Section
10.3 shall in no event exceed the value of the Merger Consideration,  determined
as of the Closing Date.

         10.6 Exclusive  Remedy.  TCGI and Sub  acknowledge and agree that, from
and after the Closing,  their sole and exclusive  remedy with respect to any and
all  claims  relating  to the  subject  matter  of this  Agreement  shall be the
indemnification  provisions  set forth in Sections 6.5 and 10. In furtherance of
the foregoing,  each of TCGI and Sub hereby waives,  from and after the Closing,
to the fullest extent permitted under applicable law, any and all other rights,





<PAGE>



claims  and  causes of action  (other  than tort  claims of, or causes of action
arising from, fraudulent misrepresentation) it may have against the Stockholders
relating  to the  subject  matter of this  Agreement  arising  or based upon any
federal, state, local or foreign statute, law, ordinance,  rule or regulation or
otherwise.  Each of TCGI and Sub further  acknowledges and agrees that (i) other
than the  representations  and  warranties of the  Stockholders  and the Company
specifically contained in this Agreement (including the Schedules hereto), there
are no  representations  or  warranties of the  Stockholders  and the Company or
their  representatives  or any other  Person,  either  express or implied,  with
respect to the Company and its subsidiaries and their respective  businesses and
(ii) it shall  have no claim or right to  indemnification  with  respect  to any
information,  documents or materials furnished by the Stockholders,  the Company
or  their  representatives  or  any  other  Person  or any  of  their  officers,
directors,  employees, agents or advisors, including any information,  documents
or  material  made  available  to  TCGI  in  certain  "data  rooms,"  management
presentations or any other form in expectation of the transactions  contemplated
by this Agreement.


SECTION   11            MISCELLANEOUS

         11.1  Expenses.  Except as  otherwise  provided  herein,  all costs and
expenses,  including,  without  limitation,  fees and  disbursements of counsel,
financial  advisors and accountants,  incurred in connection with this Agreement
and the  transactions  contemplated  hereby shall be paid by the party incurring
such costs and expenses,  whether or not the Closing shall have  occurred.  TCGI
shall pay all HSR Act filing fees required in connection  with the  transactions
contemplated by this Agreement.  All transfer,  stamp, real property transfer or
gains and similar Taxes  incurred as a result of the  transactions  contemplated
hereby and any other governmental and regulatory filing fees (other than the HSR
Act filing fees)  incurred by either party in connection  with the  transactions
contemplated  by this Agreement shall be paid one half by the  Stockholders  and
one half by TCGI.

         11.2  Notices.  All  notices  and  other  communications  given or made
pursuant  hereto shall be in writing and shall be deemed to have been duly given
or made as of the date  delivered  if delivered by hand,  by  telecopier  device
(confirmed  by hand  delivery or  overnight  courier  service)  or by  overnight
courier  service to the  parties at the  following  addresses  (or at such other
address for a party as shall be specified by like notice):

                  (a)  if to TCGI or Sub:

                       Teleport Communications Group Inc.





<PAGE>



                       429 Ridge Road
                       Dayton, New Jersey  08810
                       Attention:  Mr. Wayne G. Fox, Vice President
                                   and Treasurer, and W. Terrell Wingfield, Jr.,
                                   Vice President and General Counsel
                           Phone:  908-392-2000
                           Fax:    908-392-3620

                      with a copy under separate cover to:

                      Dow, Lohnes & Albertson, PLLC
                      1200 New Hampshire Avenue, N.W., Suite 800
                      Washington, D.C. 20036
                      Attention: Kevin F. Reed, Esq.
                         Phone:  202-776-2000
                         Fax:    202-776-2222

                  (b)      if to the Stockholders or the Company:

                       c/o General Atomic Technologies Corporation
                       3550 General Atomics Court
                       San Diego, CA  92121-1122
                       Attention:  Neal Blue, President, and John E.
                                   Jones, Secretary and Treasurer
                           Phone:  619-455-2152
                           Fax:    619-455-4215


                      with a copy under separate cover to:

                       Winthrop, Stimson, Putnam & Roberts
                       One Battery Park Plaza
                       New York, New York  10004
                       Attention:  Arthur H. Fredston, Esq.
                          Phone:   212-858-1000
                          Fax:     212-858-1500

      11.3 Benefit and Binding Effect. No party hereto may assign this Agreement
without the prior written  consent of the other parties  hereto.  This Agreement
shall be binding  upon and inure to the benefit of the parties  hereto and their
respective successors and permitted assigns.

      11.4 Further  Assurances.  The parties  shall take any actions and execute
any other documents that may be necessary or desirable to the implementation and
consummation of this Agreement,  including, in the case of the Stockholders, any
additional  transfer  documents that, in the reasonable  opinion of TCGI, may be
necessary to ensure,  complete,  and evidence the full and effective transfer of
the Company Shares to TCGI pursuant to this Agreement.





<PAGE>




      11.5  GOVERNING  LAW. THIS  AGREEMENT  SHALL BE GOVERNED,  CONSTRUED,  AND
ENFORCED IN ACCORDANCE WITH THE LAWS OF THE STATE OF DELAWARE (WITHOUT REGARD TO
THE CHOICE OF LAW PROVISIONS THEREOF).

      11.6  Headings.  The headings in this  Agreement  are included for ease of
reference  only and shall not control or affect the meaning or  construction  of
the provisions of this Agreement.

      11.7 Entire  Agreement.  This Agreement,  the schedules,  hereto,  and all
documents,  certificates  and other  documents  to be  delivered  by the parties
pursuant hereto,  collectively  represent the entire understanding and agreement
among the  parties  hereto  with  respect to the  subject  matter  hereof.  This
Agreement  supersedes all prior  negotiations  between the parties and cannot be
amended,  supplemented,  or changed except by an agreement in writing that makes
specific  reference to this  Agreement  and which is signed by the party against
which enforcement of any such amendment, supplement or modification is sought.

      11.8 Amendment and Waiver.  This  Agreement may not be amended or modified
except by an instrument in writing signed by the parties hereto.  Any failure of
either  party  hereto to comply  with any  obligation,  covenant,  agreement  or
condition  contained  herein may be waived by the party entitled to the benefits
thereof,  but such waiver or failure to insist upon strict  compliance with such
obligation,  covenant,  agreement or condition shall not operate as a waiver of,
or estoppel with respect to, any subsequent or other failure.

      11.9 Consent to Jurisdiction; Specific Performance.

                 (a) Each  of the  parties  hereto  irrevocably  submits  to the
jurisdiction  of any  Delaware  State or  Federal  court  sitting in the City of
Wilmington  in any  action or  proceeding  arising  out of or  relating  to this
Agreement,  and each of the parties hereto irrevocably agrees that all claims in
respect  of such  action  or  proceeding  may be heard  and  determined  in such
Delaware State or Federal court.  Each of the parties hereto hereby  irrevocably
waives,  to the  fullest  extent it may  effectively  do so,  the  defense of an
inconvenient forum to the maintenance of such action or proceeding.

                 (b) Nothing  in this  Section  11.9  shall  affect the right of
either  party to serve legal  process in any other  manner  permitted  by law or
affect the right of either party to bring any action or  proceeding  against the
other  party or its  property  in the  courts  of any other  jurisdictions.  The
consents to  jurisdiction  set forth in this Section  11.9 shall not  constitute
general  consents to service of process in the State of Delaware  and shall have
no effect for any purpose except as provided in this Section 11.9 and shall not





<PAGE>



be deemed to confer  rights on any Person other than the parties to this 
Agreement.

                 (c) Without intending to limit the remedies available to either
of the parties hereto,  each of the parties hereto  acknowledges and agrees that
if either of the Stockholders or the Company breaches this Agreement and refuses
to perform  under the  provisions of this  Agreement,  TCGI and Sub would suffer
irreparable  injury  for  which  an  adequate  remedy  at law is not  available.
Therefore,  the  parties  hereto  agree  that  TCGI and Sub shall  therefore  be
entitled,  in addition to any other  remedies that may be  available,  to obtain
specific  performance  from any court of competent  jurisdiction of the terms of
this  Agreement.  If any  action  is  brought  by  TCGI or Sub to  enforce  this
Agreement, each of the Stockholders and the Company shall waive the defense that
there is an adequate remedy at law.

      11.10 Attorneys'  Fees.  In the event of a default by either  party  which
results in a lawsuit or other  proceeding  for any remedy  available  under this
Agreement,  the  prevailing  party shall be entitled to  reimbursement  from the
other party of its reasonable legal fees and expenses.

      11.11 Counterparts.  This  Agreement  may  be  executed  in  one  or  more
counterparts  (including by means of telecopied  signature pages), each of which
shall be an original,  but all of which taken together shall  constitute one and
the same agreement.

      11.12 No Third-Party  Beneficiaries. Except as expressly  provided herein,
this Agreement is for the sole benefit of the parties hereto and their permitted
assigns and nothing  herein  expressed or implied  shall give or be construed to
give to any Person, other than the parties hereto and such assigns, any legal or
equitable rights hereunder.

      11.13 Disclaimer Regarding  Estimates and Projections.  In connection with
TCGI's investigation of the Company and its business,  TCGI has received from or
on behalf the  Company  or the  Stockholders  certain  projections  and  certain
business plan information for the periods presented  therein.  TCGI acknowledges
that there are  uncertainties  inherent in  attempting  to make such  estimates,
projections  and other  forecasts  and plans,  that TCGI is  familiar  with such
uncertainties,  that TCGI is  taking  full  responsibility  for  making  its own
evaluation of the adequacy and accuracy of all estimates,  projections and other
forecasts  and plans so furnished to it  (including  the  reasonableness  of the
assumptions underlying such estimates, projections and other forecasts) and TCGI
and Sub shall have no claim  against  the  Stockholders  with  respect  thereto.
Accordingly, the Stockholders make no representation or warranty with respect to
such  estimates,  projections  and  other  forecasts and plans (including the 





<PAGE>



reasonableness of the assumptions underlying such estimates, projections and 
forecasts).

     11.14  Revision  of  Schedules.  Notwithstanding  anything  herein  to  the
contrary,  the  Stockholders  shall  have the right to update the  Schedules  to
reflect  changes in the ordinary  course of business or  otherwise  permitted by
this Agreement that occur between the date hereof and the Closing.


SECTION 12        AGREEMENT NOT TO COMPETE

      12.1 Covenant Not to Compete.  In consideration of the other provisions of
this  Agreement  and as an  additional  inducement to TCGI and Sub to enter into
this  Agreement,  each of the  Stockholders,  James N.  Blue and  Linden S. Blue
covenants and agrees that for a period of three (3) years after the Closing, (i)
none  of  the  Stockholders,  any  Affiliate,   stockholder  or  control  Person
(including  without  limitation  James  N.  Blue  and  Linden  S.  Blue)  of the
Stockholders (other than Neal Karsten Blue), or any other Person of which either
Stockholder or any Affiliate,  stockholder or control Person (including  without
limitation  James N. Blue and Linden S. Blue) of the Stockholders has the power,
directly or indirectly,  to direct or cause the direction of management policies
(whether  through  ownership of securities  or  partnership  or other  ownership
interests,  by contract or  otherwise;  provided  that  ownership of ten percent
(10%) of the voting  equity of any Person  shall,  for  purposes of this Section
12.1, be presumed to constitute such power), will, without prior written consent
of TCGI, directly or indirectly,  own, manage, operate, join, control, or engage
or  participate  in the  ownership,  management,  operation,  or  control of any
business or  organization  any part of which  engages in the  provision of those
Internet  or  intranet  services  which are  provided  by the  Company as of the
Effective  Time  independent  of network or transport,  to commercial and retail
customers in the United States or elsewhere in North America,  including without
limitation  (A)  participation  as a  stockholder,  or partner of, or having any
direct or indirect  financial  interest in, any enterprise  which engages in the
such business, or (B) participation as an agent,  representative,  or consultant
in,  or   rendering  of  any   services   to,  any   enterprise   in  which  its
responsibilities are related to such business;  provided,  however, that nothing
in this Section 12 shall  restrict  GA, GATC or any other such Person from,  (X)
offering or providing  Internet  services in connection  with the  deployment of
manned or unmanned aircraft systems, (Y) using Websites or the Internet to offer
or provide  its  various  products  and  services,  other  than  those  services
otherwise  prohibited  by this  Section 12; and (ii)  without the prior  written
consent of TCGI, neither Stockholder nor any Affiliate of such Stockholder will,






<PAGE>



without the prior  written  consent of TCGI,  hire any  employee of the Company,
other than Neal Karsten Blue.

      12.2  Restriction  Regarding  Neal Karsten Blue. In  consideration  of the
other  provisions of this Agreement and as an additional  inducement to TCGI and
Sub to enter into this Agreement,  in the event that Neal Karsten Blue shall, at
any time,  cease to be an employee of the Company or the Surviving  Corporation,
Neal  Karsten  Blue  covenants  and agrees  that for a period of three (3) years
after the  Closing,  (i) none of Neal  Karsten  Blue or any  Person  which  Neal
Karsten Blue owns, controls or has the power, directly or indirectly,  to direct
or cause the  direction of management  policies  (whether  through  ownership of
securities  or  partnership  or  other  ownership  interests,   by  contract  or
otherwise;  provided that ownership of ten percent (10%) of the voting equity of
any Person  shall,  for purposes of this Section 12.2, be presumed to constitute
such  power),   will,  without  prior  written  consent  of  TCGI,  directly  or
indirectly, own, manage, operate, join, control, or engage or participate in the
ownership,  management,  operation,  or control of any business or  organization
which engages primarily in the provision of those Internet and intranet services
which are  provided  by the  Company as of the  Effective  Time  independent  of
network or transport, to commercial and retail customers in the United States or
elsewhere in North America,  including without limitation (A) participation as a
stockholder,  or partner of, or having any direct or indirect financial interest
in,  any  enterprise  which  engages  primarily  in the  such  business,  or (B)
participation as an agent, representative, or consultant in, or rendering of any
services to, any enterprise in which its  responsibilities are primarily related
to such  business;  and (ii) Neal  Karsten  Blue shall not disclose to others or
take or use for Neal  Karsten  Blue's own  purpose or the  purposes of any other
Person (including without  limitation any employer or any Person owned,  managed
or advised by Neal Karsten Blue),  any technical or business  information  which
the Company or the Surviving  Corporation  reasonably  treats as confidential or
other proprietary information of the Company or the Surviving Corporation.

      12.3 Exception.  Notwithstanding  Section 12.1 or 12.2, the restriction on
financial  interest  contained in this Agreement shall not apply to ownership of
(i) a company's  stock listed on a national  securities  exchange or the NASDAQ,
which  constitute  less than ten percent (10%) of the  outstanding  voting stock
thereof and does not  otherwise  constitute  control  over such  company or (ii)
ownership of equity  securities  constituting not more than ten percent (10%) of
the voting  interests of a privately held company in which such interest is held
solely as a passive  investment and in which such Person described in clause (i)
of  Section  12.1  or in  Section  12.2  has no  power  to  direct  or  actively
participate in the management of such company.





<PAGE>




      12.4 Remedies.  Each  Stockholder  agrees that if either of them or any of
their respective  Affiliates engages or threatens to engage in any activity that
constitutes  a violation of the  provisions  of this Section 12, TCGI shall have
the right and remedy to have the  provisions  of this  Section  12  specifically
enforced to the extent  permitted  by law by any court having  jurisdiction,  it
being  acknowledged  and agreed  that any breach of this  Agreement  would cause
immediate irreparable injury to TCGI and that money damages would not provide an
adequate  remedy  at law for any  breach.  Such  right  and  remedy  shall be in
addition to, and not in lieu of, any other rights and remedies available to TCGI
at law or in equity.

      12.5 Reformation.  If any of the provisions or covenants contained in this
Section  12 are held to be  unenforceable  in any  jurisdiction  because  of the
duration or scope thereof,  the court making such  determination  shall have the
power to reduce the duration and/or scope of the provision or covenant,  and the
provision  or  covenant  in its  reduced  form shall be  enforceable;  provided,
however,   that  the   determination   of  such  court   shall  not  affect  the
enforceability of any portion of this Agreement in any other jurisdiction.






<PAGE>





         IN WITNESS  WHEREOF,  this  Agreement  has been executed by the parties
hereto as of the date first written above.



                                     GENERAL ATOMIC TECHNOLOGIES
                                     CORPORATION



                                     By:   /s/ James N. Blue
                                        __________________________________
                                        Name:   James N. Blue
                                        Title:  President


                                     GENERAL ATOMICS



                                     By:   /s/ James N. Blue
                                        __________________________________
                                        Name:   James N. Blue
                                        Title:  President


                                     CERFNET SERVICES, INC.



                                     By:   /s/ Pushpendra Mohta
                                        __________________________________
                                        Name:   Pushpendra Mohta
                                        Title:  Vice President



                                     TELEPORT COMMUNICATIONS GROUP INC.



                                     By:   /s/ Wayne G. Fox
                                        __________________________________
                                        Name:   Wayne G. Fox
                                        Title:  Vice President and
                                                Treasurer


                                     CNSI ACQUISITION CORP.



                                     By:   /s/ W. Terrell Wingfield, Jr.
                                        __________________________________
                                        Name:   W. Terrell Wingfield, Jr.
                                        Title:  Vice President and
                                                General Counsel





<PAGE>





         Solely with respect to Section 2.8(a) and Section 12:



                                     /s/ Neal Karsten Blue
                                     ----------------------------
                                     NEAL KARSTEN BLUE


         Solely with respect to Section 2.8(a):


                                     /s/ Pushpendra Mohta
                                     ----------------------------
                                     PUSHPENDRA MOHTA





<PAGE>


         Solely with respect to Section 12:



                                     /s/ James N. Blue
                                     ---------------------
                                     JAMES N. BLUE


                                     /s/ Linden S. Blue
                                     ---------------------
                                     LINDEN S. BLUE






<PAGE>
                                                                      EXHIBIT C

                          REGISTRATION RIGHTS AGREEMENT

         THIS REGISTRATION  RIGHTS AGREEMENT (this  "Agreement") is entered into
as of February 4, 1997 by and among GENERAL ATOMIC TECHNOLOGIES CORPORATION,  a
Wyoming corporation ("GATC"),  GENERAL ATOMICS, a California corporation ("GA"),
NEAL KARSTEN BLUE ("Blue") and PUSHPENDRA MOHTA ("Mohta" and,  collectively with
GA, GATC and Blue, the  "Holders"),  and TELEPORT  COMMUNICATIONS  GROUP INC., a
Delaware corporation (the "Company").

  WHEREAS,  the Company and the  Holders  are party to a Merger  Agreement  (the
"Merger Agreement"), dated as of January 13, 1997, pursuant to which the Company
has agreed to issue shares of the Company's Class A Common Stock, par value $.01
per share  ("TCGI  Common  Stock"),  to the  Holders in  exchange  for shares of
capital stock of CERFnet Systems, Inc., a Delaware corporation; and

  WHEREAS, the Company has agreed to grant certain rights with respect to shares
of TCGI Common Stock issued to the Holders pursuant to the Merger Agreement;

  NOW,  THEREFORE,  in consideration of the foregoing and of the mutual promises
and covenants contained herein, the parties hereby agree as follows:


                                    ARTICLE 1
                                   DEFINITIONS

  As used  herein,  the  following  terms  shall have the  following  respective
meanings:

1.1 "Commission" shall mean the Securities and Exchange Commission or any other
federal agency at the time administering the Securities Act.

1.2 "Exchange Act" shall mean the Securities Exchange Act of 1934, as amended.

1.3 "Holders"  shall mean and include  any person or persons who have  executed
this  Agreement  and whose names appear on the Schedule of  Registration  Rights
Holders,  attached  hereto as  Schedule  A, or who shall,  pursuant to Article 8
hereof, become parties hereto.





<PAGE>




1.4 The  terms  "register,"   "registered"  and   "registration"   refer  to  a
registration  effected  by  preparing  and filing a  registration  statement  in
compliance  with the  Securities  Act,  and the  declaration  or ordering of the
effectiveness of such registration statement.

1.5 "Registrable Securities"  means any and all (i) shares of TCGI Common Stock
held by the Holders and  identified on Schedule A and (ii) any securities of the
Company issued or issuable with respect to any securities  referred to in clause
(i) above,  upon any stock split,  stock dividend,  recapitalization  or similar
event, which shares have not been sold to the public;  provided,  however,  that
such shares shall cease to be treated as Registrable Securities if they are then
eligible to be sold,  pursuant to Rule 144(k)  promulgated  under the Securities
Act (or any similar successor  provision  thereto) and the holder of such shares
is not then an  "affiliate"  of the  Company  within  the  meaning  of such Rule
144(k).

1.6 "Registration Expenses" shall mean all expenses  incurred by the Company in
complying   with  Article  2  hereof,   including,   without   limitation,   all
registration,  qualification  and  filing  fees,  printing  expenses,  fees  and
disbursements  of legal counsel and accountants  for the Company,  blue sky fees
and expenses,  and the expense of any special audits  incident to or required by
any such  registration  (but excluding the compensation of regular  employees of
the Company which shall be paid in any event by the Company).

1.7 "Securities  Act" shall mean the Securities Act of 1933, as amended, or any
similar  federal  statute  and  the  rules  and  regulations  of the  Commission
thereunder, all as the same shall be in effect at the time.

1.8 "Selling  Expenses" shall mean all underwriting  fees,  discounts,  selling
commissions and stock transfer taxes  applicable to the  Registrable  Securities
registered  by the Holders  and fees of any  counsel  employed by the Holders in
connection with an registration hereunder.


                                     ARTICLE 2
                             PIGGYBACK REGISTRATION

2.1 Notice of Registration to Holders.  If at any time or from time to time the
Company shall  determine to register any of its  securities,  either for its own
account  or the  account  of a  security  holder or  holders,  other  than (i) a
registration  relating  solely  to  employee  benefit  plans on Form S-8 (or any
successor form) or (ii) a registration  relating solely to a Commission Rule 145
transaction on Form S-4 (or any successor form), the Company will:





<PAGE>




        (a)       promptly give to each Holder written notice thereof; and

        (b)  subject  to the  terms  and  conditions  hereof,  include  in  such
registration  (and  any  related  qualification  under  blue  sky  laws or other
compliance),  and in any  underwriting  involved  therein,  all the  Registrable
Securities specified in a written request or requests, made within 15 days after
receipt of such written notice from the Company  described in Section 2.1(a), by
any Holder or Holders.

2.2 Underwriting.

        (a) If the  registration  of which  the  Company  gives  notice is for a
registered  public  offering  involving an  underwriting,  the Company  shall so
advise the Holders as a part of the  written  notice  given  pursuant to Section
2.1(a). In such event, the right of any Holder to registration  pursuant to this
Article  2  shall  be  conditioned  upon  such  Holder's  participation  in such
underwriting  and the inclusion of such Holder's  Registrable  Securities in the
underwriting to the extent provided herein.  All Holders proposing to distribute
their  securities  through such  underwriting  shall (together with the Company)
enter  into an  underwriting  agreement  in  customary  form  with the  managing
underwriter selected for such underwriting by the Company, with all such Holders
agreeing  to the same  terms and  conditions  as the  Company  to the extent the
Company is also seeking to distribute  securities  as part of such  underwritten
offering. In any such underwritten offering, the range for the offering price at
which Registrable  Securities and other securities included in such underwritten
offering shall be offered for sale, as set forth in the  preliminary  prospectus
for such offering,  and the price at which such Registrable Securities and other
securities  included in such underwritten  offering shall be sold to the public,
as set forth in the prospectus for such offering,  shall be mutually  determined
by the Company and the managing underwriter(s) for such offering.

        (b)  Notwithstanding  any  other  provision  of this  Article  2, if the
managing  underwriter  determines that marketing factors require a limitation of
the number of shares to be underwritten, the underwriter may exclude some or all
Registrable  Securities from such  registration  and  underwriting.  The Company
shall so advise all Holders of Registrable Securities,  and the number of shares
of Registrable Securities to be included in such registration shall be allocated
as follows:  first,  for the account of the Company,  all shares of Common Stock
proposed to be sold by the Company;  second, for the account of any stockholders
of  the  Company  having registration rights existing prior to the date of this





<PAGE>



Agreement (and their  respective  successors and assigns) and  participating  in
such registration, the number of shares of Common Stock requested to be included
in  the  registration  by  such   stockholders  in  proportion,   as  nearly  as
practicable,  to the  respective  amounts  of  Registrable  Securities  that are
proposed to be offered and sold by such  stockholders of Registrable  Securities
at the time of filing the  registration  statement;  third,  for the  account of
Holders of Registrable  Securities  participating  in such  registration and any
stockholders having  registration rates of equal priority with the Holders,  the
number of shares of Common Stock requested to be included in the registration by
such Holders or such other stockholders in proportion, as nearly as practicable,
to the  respective  amounts of  Registrable  Securities  that are proposed to be
offered and sold by such  Holders  and such other  stockholders  of  Registrable
Securities at the time of filing the registration statement; and fourth, for the
account  of  any  other  stockholders  of  the  Company  participating  in  such
registration,  the number of shares of Common Stock  requested to be included in
the  registration  by such  other  stockholders  in  proportion,  as  nearly  as
practicable,  to the  respective  amounts  of  Registrable  Securities  that are
proposed  to be  offered  and sold by such  other  stockholders  of  Registrable
Securities  at the time of filing the  registration  statement.  No  Registrable
Securities  excluded  from  the  underwriting  by  reason  of the  underwriters'
marketing limitation shall be included in such registration.

        (c) The Company  shall so advise all Holders and the other  stockholders
distributing  their securities through such underwriting of any such limitation,
and the number of shares of Registrable  Securities  held by Holders that may be
included in the  registration  and  underwriting  shall be  allocated  among all
Holders in proportion,  as nearly as practicable,  to the respective  amounts of
Registrable  Securities  held by all  such  Holders  at the time of  filing  the
registration  statement.  If any  Holder  disapproves  of the  terms of any such
underwriting,  such Holder may elect to withdraw  therefrom by written notice to
the Company and the managing  underwriter  prior to the initial  distribution of
preliminary  prospectuses with respect to such underwritten  offering or at such
earlier time as the Company may prescribe.  Any securities excluded or withdrawn
from such underwriting shall be withdrawn from such registration, but the Holder
shall continue to be bound by Article 6 hereof.  If  Registrable  Securities are
not withdrawn by such time, the Holder of such Registrable Securities shall have
no right to withdraw such  Registrable  Securities  from such  registration  and
shall be obligated to sell such registrable Securities at a price per share (the
"Sale Price") to be  determined  by the Company and the managing  underwriter(s)
for such underwritten  offering,  provided that such Sale Price is either within
the range set forth on the cover of the preliminary  prospectus relating to such






<PAGE>



underwritten offering or is in excess of the highest offering price set forth in
such range.  Any  Registrable  Securities  that are withdrawn from  registration
pursuant  to  this  Section   2.2(c)  shall  not  be  transferred  in  a  public
distribution prior to 90 days after the effective date of such registration,  or
such  other  shorter  period  of time as the  managing  underwriter(s)  for such
registration may require.

        (d) The  Company  shall  have the right to  terminate  or  withdraw  any
registration  initiated by it under this Article 2 prior to the effectiveness of
such  registration,  whether or not any Holder has elected to include securities
in  such  registration;  provided,  however,  that  the  Company  shall  pay all
Registration Expenses incurred in connection with such terminated registration.


                                    ARTICLE 3
                            EXPENSES OF REGISTRATION

  In connection  with any  registration or  qualification  pursuant to Article 2
hereof,  the  registering  Holders  shall  bear a  portion  of the  Registration
Expenses  equal to a fraction,  the numerator of which is equal to the amount of
securities  that  are  registered  by  such  Holders  in  connection  with  such
registration  and the  denominator  of  which  is  equal  to the  amount  of all
securities that are included in such registration. All Selling Expenses relating
to securities  registered  by the Holders  shall be borne by such Holders.  Each
Holder shall bear any other  out-of-pocket  expenses of such Holder  incurred in
connection with any registration hereunder.


                                    ARTICLE 4
                             REGISTRATION PROCEDURES

  In the case of each registration,  qualification or compliance effected by the
Company  pursuant  to  this  Agreement,   the  Company  will  keep  each  Holder
participating  in such  registration  advised in writing as to the initiation of
each  registration,  qualification  and  compliance  and  as to  the  completion
thereof.  At its  expense  the Company  will,  in the event of any  underwritten
public  offering,  enter into and perform its obligations  under an underwriting
agreement,  in usual and customary form,  with the managing  underwriter of such
offering,  and each Holder  participating in such underwriting  shall also enter
into and perform its  obligations  under such an  agreement.  The Company  shall
furnish to each Holder  participating  in any  registration and the underwriters
such  number  of  copies  of the  registration  statement,  each  amendment  and
supplement thereto, and the prospectus included in such registration statement





<PAGE>



(including each preliminary prospectus) as such parties may reasonably request.


                                    ARTICLE 5
                                 INDEMNIFICATION

5.1 Indemnification  by  Company.  In the  event  the  Company  shall  effect a
registration of any shares owned by any Holder,  the Company will indemnify each
Holder and each of its directors and officers and each person  controlling  such
Holder within the meaning of Section 15 of the  Securities Act and Section 20 of
the Exchange Act, and each underwriter, if any, and each person who controls any
underwriter  within the meaning of Section 15 of the  Securities Act and Section
20 of the  Exchange  Act,  against all  expenses,  claims,  losses,  damages and
liabilities  (or actions in respect  thereof),  including  any of the  foregoing
incurred in settlement of any litigation,  commenced or threatened,  arising out
of or based on any untrue statement (or alleged untrue  statement) of a material
fact contained in any registration statement or prospectus,  or any amendment or
supplement  thereto,  incident  to any such  registration,  or arising out of or
based on any omission (or alleged  omission) to state  therein,  a material fact
required to be stated  therein or necessary to make the statements  therein,  in
light of the circumstances under which they were made, not misleading,  and will
reimburse each such Holder, director or officer and each person controlling such
Holder, each such underwriter and each person who controls any such underwriter,
for any legal and any other  expenses  reasonably  incurred in  connection  with
investigating, preparing or defending any such claim, loss, damage, liability or
action; provided,  however, that the Company will not be liable in any such case
to the extent that any such claim, loss, damage, liability or expense arises out
of or is based on any untrue  statement or omission or alleged untrue  statement
or  omission,  (i)  made  in  reliance  upon  and  in  conformity  with  written
information furnished to the Company by such Holder or underwriter and expressly
intended for use in such registration statement or prospectus,  or any amendment
or supplement  thereto or (ii) made in any preliminary  prospectus or prospectus
if the Company  shall have  corrected  such  statement  or  omission  and timely
furnished a copy of an amended or  supplemented  prospectus to such Holder or to
the person  alleging the omission or  misstatement  prior to the time of written
confirmation of such sale of Registrable Securities.

5.2 Indemnification  by the  Holders.  In the event the Company  shall effect a
registration of any shares owned by any Holder, each such Holder will, severally
and not  jointly,  indemnify  the  Company,  each  underwriter  and  each of its
respective officers and directors,  if any, of the Company's  securities covered






<PAGE>



by such a registration  statement,  each person who controls the Company or such
underwriter  within the meaning of Section 15 of the  Securities Act and Section
20 of the Exchange Act, and each other such Holder,  and each person controlling
such Holder within the meaning of Section 15 of the  Securities  Act and Section
20 of the  Exchange  Act,  against all  expenses,  claims,  losses,  damages and
liabilities  (or actions in respect  thereof),  including  any of the  foregoing
incurred in settlement of any litigation,  commenced or threatened,  arising out
of or based on any untrue statement (or alleged untrue  statement) of a material
fact  contained  in  any  such  registration  statement  or  prospectus,  or any
amendment or supplement  thereto,  incident to any such  registration or arising
out of or based on any  omission  (or  alleged  omission)  to  state  therein  a
material fact required to be stated  therein or necessary to make the statements
therein,  in  light  of the  circumstances  under  which  they  were  made,  not
misleading,  and will reimburse the Company, such Holders,  director or officer,
such  underwriters  or  control  persons  for any  legal or any  other  expenses
reasonably incurred in connection with investigating, preparing or defending any
such claim, loss,  damage,  liability or action, in each case to the extent that
such untrue  statement  (or alleged  untrue  statement)  or omission (or alleged
omission) is made in such  registration  statement or prospectus or amendment or
supplement in reliance upon and in conformity with written information furnished
to  the  Company  by  such  Holder  and  expressly  intended  for  use  in  such
registration  statement or prospectus  or any  amendment or supplement  thereto;
provided,  however,  that the maximum liability of any Holder under this Section
5.2 in regard to any registration  statement shall in no event exceed the amount
of the proceeds received by such Holder from the sale of Registrable  Securities
under such registration statement.

5.3 Procedures for Indemnification. Each party entitled to indemnification under
this Article 5 (the "Indemnified Party") shall give notice to the party required
to  provide  indemnification  (the  "Indemnifying  Party")  promptly  after such
Indemnified Party has actual knowledge of any claim as to which indemnity may be
sought,  and shall  permit the  Indemnifying  Party to assume the defense of any
such claim or any litigation resulting therefrom,  provided that counsel for the
Indemnifying  Party,  who shall conduct the defense of such claim or litigation,
shall  be  approved  by  the   Indemnified   Party  (whose  approval  shall  not
unreasonably be withheld or delayed).  The Indemnified  Party may participate in
such  defense  at  such  party's  expense;  provided,  however  that  if (i) the
employment of such counsel by the  Indemnified  Party has been authorized by the
Indemnifying  Party, (ii) the Indemnifying  Party shall have been advised by its
counsel that there is a conflict of interest between the Indemnifying  Party and
the  Indemnified  Party in the  conduct of the  defense of such action (in which
case the  Indemnifying  Party  shall not have the right to direct the defense of
such action on





<PAGE>



behalf of the Indemnified  Party) or (iii) the  Indemnifying  Party shall not in
fact have  employed  counsel to assume the defense of such action,  then in each
such case the fees and expenses of such  counsel  shall be at the expense of the
Indemnifying  Party).  The  failure of any  Indemnified  Party to give notice as
provided  herein  shall not relieve the  Indemnifying  Party of its  obligations
under this  Agreement,  unless such  failure is  materially  prejudicial  to the
ability of the Indemnifying  Party to defend the action. No Indemnifying  Party,
in the defense of any such claim or litigation,  shall,  except with the consent
of each  Indemnified  Party,  consent to entry of any judgment or enter into any
settlement which does not include as an unconditional term thereof the giving by
the  claimant  or  plaintiff  to such  Indemnified  Party of a release  from all
liability in respect of such claim or litigation.

5.4 Contribution. If the indemnification  provided for in Section 5.1 or 5.2 is
unavailable or  insufficient  to hold harmless an Indemnified  party,  then each
Indemnifying  Party  shall  contribute  to the  amount  paid or  payable by such
Indemnified Party as a result of the losses,  claims, damages or liabilities (or
actions or  proceedings in respect  thereof) or expenses  referred to in Section
5.1 or 5.2, in such  proportion as is  appropriate to reflect the relative fault
of the Company on the one hand and the sellers of Registrable  Securities on the
other hand in connection  with  statements or omissions  which  resulted in such
losses,  claims,  damages or  liabilities  (or actions or proceedings in respect
thereof) or expenses,  as well as any other relevant  equitable  considerations.
The  Company and the Holders  agree that it would not be just and  equitable  if
contributions  pursuant to this  Section 5.4 were to be  determined  by pro rata
allocation  (even if all sellers of Registrable  Securities  were treated as one
entity for such  purpose) or by any other  method of  allocation  which does not
take account of the equitable  considerations  referred to in the first sentence
of this Section 5.4. The amount paid by an Indemnified  Party as a result of the
losses,  claims,  damages or  liabilities  (or actions or proceedings in respect
thereof) or expenses referred to in the first sentence of this Section 5.4 shall
be deemed to include  any legal or other  expenses  reasonably  incurred by such
Indemnified  Party in  connection  with  investigating  or defending  any claim,
action or proceeding  which is the subject of this Section 5.4.  Notwithstanding
the  provisions  or this Section 5.4, no Holder shall be required to  contribute
any amount in excess of the amount by which the total  proceeds  received  by it
from  the  sale  of  its  Registrable  Securities  pursuant  to  the  applicable
registration  statement  exceeds the amount of any damages  that such Holder has
otherwise  been  required to pay  pursuant to this  Agreement  by reason of such
untrue or alleged untrue  statement or omission or alleged  omission.  No person
guilty of fraudulent  misrepresentation  (within the meaning of Section 11(f) of






<PAGE>



the Securities  Act) shall be entitled to  contribution  from any person who was
not guilty of such fraudulent  misrepresentation.  The obligations of sellers of
Registrable  Securities  to  contribute  pursuant  to this  Section 5.4 shall be
several in proportion to the respective amount of Registrable Securities sold by
them pursuant to a registration statement and not joint.

5.5 Conflicting Terms.  Notwithstanding  the foregoing,  to the extent that the
provisions on  indemnification  and  contribution  contained in an  underwriting
agreement entered into in connection with an underwritten public offering are in
conflict  with the foregoing  provisions,  the  provisions  in the  underwriting
agreement shall control.


                                    ARTICLE 6
                                LOCKUP AGREEMENT

  In  consideration  for the  Company  agreeing  to its  obligations  under this
Agreement,  each Holder agrees,  in connection  with any  registration  effected
pursuant  to Article  2, that any  Holder  electing  not to  participate  in, or
withdrawing from, such registration  shall, upon the request of the underwriters
managing the offering of the Company's securities, not sell, make any short sale
of, loan,  grant any option for the  purchase  of, or  otherwise  dispose of any
Registrable  Securities (other than those included in such registration) without
the prior written consent of such underwriters until such period of time (not to
exceed the period  commencing seven (7) days prior to the effective date of such
registration  and ending  ninety (90) days after such  effective  date) from the
effective date of such registration or, if earlier, the day distribution of such
securities  is completed or the  underwriters  have sold all  securities  of the
Company allotted to them pursuant to such registration.


                                    ARTICLE 7
                              INFORMATION BY HOLDER

  The Holder or Holders of Registrable  Securities  included in any registration
shall furnish in writing to the Company such  information  regarding such Holder
or  Holders  and the  distribution  proposed  by such  Holder or  Holders as the
Company  may  request  and  as  shall  be  required  in   connection   with  any
registration, qualification or compliance referred to in this Agreement.


                                    ARTICLE 8
                         TRANSFER OF REGISTRATION RIGHTS

  The rights to cause the Company to register Registrable Securities granted to





<PAGE>



any Holder  under  Article 2 may be  assigned  to a  transferee  or  assignee in
connection  with any transfer or  assignment of  Registrable  Securities by such
Holder;  provided that no transfer or assignment  shall be made pursuant to this
Article 8 unless: (a) notice of such assignment is given to the Company, (b) the
Company shall have received either (i) a written  opinion of counsel  reasonably
satisfactory  to the Company,  addressed to the Company,  to the effect that the
proposed transfer of Registrable  Securities,  or of an interest therein, may be
effected without registration under the Securities Act or under applicable state
securities  laws  or  (ii)  such  representation  letters  as it may  reasonably
require, in form and substance reasonably satisfactory to the Company, to ensure
compliance  with the  provisions  of the  Securities  Act and  applicable  state
securities  laws,  and (c) such  transferee or assignee  shall have executed and
delivered to the Company,  as a condition to its acquisition of such Registrable
Securities,  an instrument in form and substance reasonably  satisfactory to the
Company  confirming that such transferee takes such Registrable  Securities,  or
interest  therein,  subject  to,  and  agrees  to be bound  by,  all the  terms,
conditions and obligations of this Agreement.


                                    ARTICLE 9
                                  MISCELLANEOUS

9.1 Waivers  and  Amendments.  With the  written  consent of the Company and the
holders  of a majority  of the  Registrable  Securities  then  outstanding,  the
obligations  and rights of the Company and the Holders under this  Agreement may
be waived (either generally or in a particular instance, either retroactively or
prospectively,  and either for a specified  period of time or  indefinitely)  or
amended;  provided,  however,  that no such waiver or amendment shall reduce the
aforesaid  number of shares the holders of which are  required to consent to any
waiver or amendment,  without the consent of all the Holders.  This Agreement or
any provision hereof may be amended, waived,  discharged or terminated only by a
statement  in  writing  signed by the party  against  which  enforcement  of the
amendment,  waiver,  discharge or  termination  is sought,  except to the extent
provided in this Section 9.1.

9.2 Governing  Law.  This  Agreement  shall  be  governed  by and  construed  in
accordance  with the laws of the State of Delaware  applicable to contracts made
and to be performed  entirely  within the state without  regard to principles of
conflicts of law.

9.3 Successors and Assigns.  Except as otherwise  expressly provided herein, the
provisions  hereof  shall  inure to the  benefit  of, and be binding  upon,  the
successors, assigns, heirs, executors and administrators of the parties hereto.





<PAGE>




9.4 Entire   Agreement.   This  Agreement   constitutes   the  full  and  entire
understanding  and  agreement  between  the  parties  with regard to the subject
matter hereof.

9.5 Notices. All notices, requests, consents, and other communications hereunder
shall be in writing  and shall be deemed  effectively  given and  received  upon
delivery in person,  or one  business day after  delivery by national  overnight
courier  service  or  by  telecopier   transmission   with   acknowledgment   of
transmission  receipt,  or three  business  days after  deposit via certified or
registered mail, return receipt requested, in each case addressed as follows:

  if to the Company, to:

         Teleport Communications Group Inc.
         429 Ridge Road
         Dayton, New Jersey  08810
         Attention:  Mr. Wayne G. Fox
                     Vice President and Treasurer
         Telecopier:  (908) 392-3620

  with copies to:

         Teleport Communications Group Inc.
         429 Ridge Road
         Dayton, New Jersey  08810
         Attention:  W. Terrell Wingfield, Jr., Esq.
                     Vice President and General Counsel
         Telecopier:  (908) 392-3620; and

         Dow, Lohnes & Albertson
         1200 New Hampshire Avenue, N.W.
         Washington, D.C.  20036-6802
         Attention:  Kevin F. Reed, Esq.
         Telecopier:  (202) 776-2222

if to the Holders, at the address shown in the records of the Company.

or, in any such case,  at such other  address  or  addresses  as shall have been
furnished in writing by such party to the others.

9.6 Severability.  In case any  provision  of this  Agreement  shall be invalid,
illegal or  unenforceable,  the  validity,  legality and  enforceability  of the
remaining  provisions  of this  Agreement  shall not in any way be  affected  or
impaired thereby.

9.7 Titles and Subtitles.  The titles of the sections and subsections  of  this





<PAGE>



Agreement are for  convenience of reference only and are not to be considered in
 construing this Agreement.

9.8 Counterparts.  This Agreement may be executed in any number of counterparts,
each of which shall be an original,  but all of which  together  constitute  one
instrument.






<PAGE>



  IN WITNESS  WHEREOF,  the parties have executed this  Agreement as of the date
first above written.

                                    TELEPORT COMMUNICATIONS GROUP INC.



                                    By:    /s/ Wayne G. Fox
                                        __________________________________
                                        Name:   Wayne G. Fox
                                        Title:  Vice President and Treasurer



                                    GENERAL ATOMIC TECHNOLOGIES CORPORATION



                                    By:    /s/ James N. Blue
                                        __________________________________
                                        Name:   James N. Blue
                                        Title:  President


                                    GENERAL ATOMICS



                                    By:    /s/ James N. Blue
                                        __________________________________
                                        Name:    James N. Blue
                                        Title:   President



                                       /s/ Neal Karsten Blue
                                    ______________________________________
                                           NEAL KARSTEN BLUE



                                       /s/ Pushpendra Mohta
                                    ______________________________________
                                           PUSHPENDRA MOHTA






<PAGE>


                                   SCHEDULE A

                           Registration Rights Holders


Party                                                         Number of Shares

General Atomic Technologies
Corporation                                                   1,622,840

General Atomics                                                 374,876

Neal Karsten Blue                                                53,910

Pushpendra Mohta                                                 48,374






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