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RFC 1123 is one of a pair that defines and discusses the requirements for host system implementations of the Internet Protocol Suite. This RFC 1123 covers the applications layer and support protocols. Its companion RFC (RFC 1122), "Requirements for Internet Hosts -- Communication Layers" (INTRO:1) covers the lower layer protocols: Transport Layer, IP Layer, and Link Layer.!! More Information There might be more information for this subject on one of the following: