Part II-6. IP SUPPORT PROTOCOLS
The Internet Protocol (IP) is the key network layer protocol that implements the TCP/IP protocol suite. Since IP is the protocol that provides the mechanism for delivering datagrams between devices, it is designed to be relatively basic. For example, it lacks provisions for some way to allow errors to be reported back to a transmitting device, and for tests and special tasks to be accomplished. These auxiliary capabilities are necessary for the operation of an internetwork, however, so TCP/IP includes support protocols that help IP perform these tasks. This part examines the two main IP support protocols: the Internet Control Message Protocol (ICMP) and ...
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