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1.3 The Internet Protocols

The Internet Protocol Suite (usually referred to as just TCP/IP)1 consists of a number of different protocols at different levels or “layers.” For our purposes, three protocols provide the fundamental communications mechanisms. All other defined protocols are referred to as user-level protocols (e.g., HTTP, used later in this web page).



It should be noted that although the Internet seems to have conquered the world, there are other networking protocol suites in existence and in use.