Internet protocols are the whole of most used upper layer protocols for the use in LAN and WAN environment. They were developed in the second half of the '70 by the American agency DARPA (Defence Advanced Research Projects Agency) to carry out a packet communication network which connecting heterogeneous computers. Later these protocols were integrated in the BSD version of the UNIX operating system and they became a standard for this environment. Starting from the UNIX environment, Internet has then become the standard for any operating system. The Internet protocols are an 'open' and 'not proprietary' standard whose documentation and specifications are public and available in Request For Comments (RFCs). RFCs are published and managed by Internet Engineering Task Force (IETF), which is formed by the representatives of different institutions and industries. The IETF deals with the evolution of Internet protocols.
The following figure shows the whole of Internet protocols and like the latter they insert in the OSI Model.
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