RFCs

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RFCs

Anyone interested in learning more about TCP/IP can find out more by reading the series of published standards called Request For Comments (RFCs). These standards can be thought of as the living documents of the Internet and are constantly under various stages of completion, acceptance, or planned obsolescence. Each enhancement or feature to the TCP/IP protocol is described by a particular RFC number. Whenever a significant change to a feature is recommended or suggested, and enough of the Internet community agrees on the change, a new RFC is created to discuss the new implementation and place it under further study.

RFCs are referred to as the living documents of the Internet because RFCs are never updated or deleted, much like the Constitution of the United States. Every addition or change is an amendment to the original. Therefore changes require the creation of a new RFC number, and always reference the original RFC they are intended to replace or enhance.

To keep track of whether RFCs are current, under progress, or no longer used, a classification system was created indicating the status of any individual RFC. These classifications are Required, Recommended, Elective, Limited Use, and Not Recommended. When you read an RFC, you may notice that different terminology is used. For instance, in the case of a particular implementation detail that is Required, the terminology used in the RFC says that this implementation must be used. In the case of a recommended implementation, the RFC uses the word “should.” The elective portions are discussed in terms of how a protocol may do a particular feature. And of course, for those implementations that are not recommended, the use of “should not” is often seen. To view Internet RFCs, check out the following URL:

http://ds.internic.net/ds/dspg1intdoc.html

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