When Berkley University began including TCP/IP in its version of UNIX, the protocol suite entered the mainstream. Unfortunately, it entered the mainstream as a UNIX-oriented set of protocols and services, resulting in a decidedly non-PC-friendly environment. For example, many of TCP/IP’s control files were stored in UNIX’ "/etc" directory, which is not a common directory on any other platform.
One of these control files is called "HOSTS" and it provides the name-to-address lookup services discussed above. There are other files here as well that also affect the ease-of-use aspects of operating a TCP/IP network. For example, the "NETWORKS" file maps IP network numbers to locally-definable names. The "SERVICES" file and the "PROTOCOL" file also provide name-to-number matching services for other functions.
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