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Talking about computer networks often means talking about Unix. Of course,Unix is not the only operating system with network capabilities, nor will itremain a frontrunner forever, but it has been in the networking business for along time, and will surely continue to be for some time to come. What makes Unix particularly interesting to private users is that there has beenmuch activity to bring free Unix-like operating systems to the PC, such as386BSD, FreeBSD, and Linux. We will describe three types of networks in this guide. We will focus on TCP/IPmost heavily because it is the most popular protocol suite in use on both LocalArea Networks (LANs) and Wide Area Networks (WANs), such as the Internet.We will also take a look at UUCP and IPX. UUCP was once commonly used totransport news and mail messages over dialup telephone connections. It is lesscommon today, but is still useful in a variety of situations. The IPX protocol isused most commonly in the Novell NetWare environment and we'll describe howto use it to connect your Linux machine into a Novell network. Each of theseprotocols are networking protocols and are used to carry data between hostcomputers. We'll discuss how they are used and introduce you to their underlyingprinciples.