IENShort for Internet Experiment Notes, a series of documents similar to RFCs concerning the early experimental work in TCP and IP. In 1977, ARPA began organizing and financing a research project to build an Internet based on the work done by Bob Kahn and Vint Cerf in 1974. Led by the Internet Working Group, the project needed a way to share technical notes and created IENs so that they wouldn��t be confused with ARPANET��s RFCs.
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