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        !             2: 
        !             3: \section      {Conclusions}
        !             4: In this paper we have suggested that it is better to perform
        !             5: {\em interface translation\/} rather than {\em protocol translation\/}
        !             6: when one is interested in migrating between two protocol suites.
        !             7: In our method,
        !             8: which uses such an interface translation approach,
        !             9: we implement the interface to the OSI Transport Services on top of the TCP.
        !            10: This has the additional advantage of facilitating the development of OSI
        !            11: applications in a robust and mature network environment,
        !            12: and in allowing us to avoid any additional work in the future when we migrate.
        !            13: In short,
        !            14: we are able to make use of a complementary co-existence between the two
        !            15: suites,
        !            16: utilizing the best of both.
        !            17: Our fundamental assumption in doing this is that the lower levels of the OSI
        !            18: protocol suite will become fully supported as we follow our
        !            19: migration strategy.
        !            20: 
        !            21: Furthermore,
        !            22: we have discussed the difficulties inherent in providing interoperability at
        !            23: the application level,
        !            24: and concluded that, as a part of a migration strategy,
        !            25: building the special-purpose gateways required for each pair of related
        !            26: applications is not a practical approach.
        !            27: Neither the protocol translation or the interface translation approach is of
        !            28: any benefit in building these gateways.
        !            29: 
        !            30: Finally,
        !            31: we have demonstrated that the DDN protocol suite,
        !            32: because of both its maturity and closeness to to the OSI suite at the TSAP
        !            33: provides an excellent migration vehicle for those users in need of
        !            34: immediate electronic communications.
        !            35: In view of the many new major investments being made in TCP/IP networks
        !            36: (e.g., by the NSF and NASA),
        !            37: we feel that our approach,
        !            38: which emphasizes {\em evolution\/} rather than {\em revolution\/},
        !            39: is a useful solution.

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