JOINT FILING AGREEMENT

                                                             Page 15 of 19 Pages

                                    EXHIBIT A

                             JOINT FILING AGREEMENT

                  The  undersigned  hereby agree that the  statement on Schedule
13D with respect to the Common Stock of Akamai Technologies, Inc. dated November
8, 1999 is, and any amendments  thereto signed by each of the undersigned  shall
be,  filed  on  behalf  of each of us  pursuant  to and in  accordance  with the
provisions of Rule 13d-1(f) under the Securities Exchange Act of 1934.

Date:  November 8, 1999

                                  XXXXX COMMUNICATIONS FUND, L.P.

                                  By:      Xxxxx Capital Partners, LLC
                                           Its General Partner


                                           By:   /S/ XXXX X. XXXXX
                                                 -------------------------------
                                                    Xxxx X. Xxxxx
                                                    Chairman


                                  XXXXX CAPITAL PARTNERS, LLC


                                  By:      /S/ XXXX X. XXXXX
                                           -------------------------------------
                                           Xxxx X. Xxxxx
                                           Chairman






                                                             Page 16 of 19 Pages



                                 XXXXXX X. XXXXX


                                 /S/ XXXXXX X. XXXXX
                                 -----------------------------------------------