RFC 1123 (rfc1123) - Page 1 of 98

Requirements for Internet Hosts - Application and Support

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Network Working Group                    Internet Engineering Task Force
Request for Comments: 1123                             R. Braden, Editor
                                                            October 1989


       Requirements for Internet Hosts -- Application and Support

Status of This Memo

   This RFC is an official specification for the Internet community.  It
   incorporates by reference, amends, corrects, and supplements the
   primary protocol standards documents relating to hosts.  Distribution
   of this document is unlimited.

Summary

   This RFC is one of a pair that defines and discusses the requirements
   for Internet host software.  This RFC covers the application and
   support protocols; its companion RFC-1122 covers the communication
   protocol layers: link layer, IP layer, and transport layer.



                           Table of Contents




   1.  INTRODUCTION ...............................................    5
      1.1  The Internet Architecture ..............................    6
      1.2  General Considerations .................................    6
         1.2.1  Continuing Internet Evolution .....................    6
         1.2.2  Robustness Principle ..............................    7
         1.2.3  Error Logging .....................................    8
         1.2.4  Configuration .....................................    8
      1.3  Reading this Document ..................................   10
         1.3.1  Organization ......................................   10
         1.3.2  Requirements ......................................   10
         1.3.3  Terminology .......................................   11
      1.4  Acknowledgments ........................................   12

   2.  GENERAL ISSUES .............................................   13
      2.1  Host Names and Numbers .................................   13
      2.2  Using Domain Name Service ..............................   13
      2.3  Applications on Multihomed hosts .......................   14
      2.4  Type-of-Service ........................................   14
      2.5  GENERAL APPLICATION REQUIREMENTS SUMMARY ...............   15




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