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                      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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