Most of us know of TCP/IP as the glue that binds the Internet. But not as many can offer a cogent description of what it is and how it works. So what is TCP/IP, really?
TCP/IP is a means for networked computers to communicate with each other. It doesn’t matter whether they are part of the same network or are attached to separate networks. It doesn’t matter if one computer is a Cray and the other a Macintosh. TCP/IP is a platform-independent standard that bridges the gap between dissimilar computers, operating systems, and networks. It’s the protocol that drives the global Internet, and it is to the Internet that TCP/IP owes much of its popularity.

Understanding TCP/IP is largely a matter of understanding a collection of arcane protocols that TCP/IP hosts use to exchange information. Let’s look at some of those protocols and see what makes TCP/IP tick

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