Answer Posted / sinu

TCP/IP consists of dozens of different protocols, but only a
few are the “MAIN” protocols that define the core operation
of the suite. Of these key protocols, two are usually
considered the most important. The Internet Protocol (IP) is
the primary OSI network layer (layer three) protocol that
provides addressing, datagram routing and other functions in
an internetwork. The Transmission Control Protocol (TCP) is
the primary transport layer (layer four) protocol, and is
responsible for connection establishment and management and
reliable data transport between software processes on
devices.IP and TCP are important because many of TCP/IP's
most critical functions are implemented at layers three and
four

Due to the importance of these two protocols, their
abbreviations have come to represent the entire
suite: “TCP/IP”

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