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Have your friend say a number and then ask you to recite the number he or she just said.Then have your friend say two new numbers and have you repeat them back.First, maintaining hosts files on a small network is somewhat feasible.However, if a network gets very large at all, it becomes an impossible task.As a Linux system administrator, it's your job to know how to provide users with this functionality. We're going to discuss how to implement domain name service (.In this world, users can't use the domain names that we are so used to in our modern lexicon.

Fortunately, in the real world, this isn't a problem.

Most operating systems are designed to use some type of hosts file to map hostnames to IP addresses.

A sample hosts file from a Linux system is shown in Figure 3.2: parameter is the alphanumeric hostname you want mapped to the IP address.

You can also use a fully qualified domain name (FQDN).

domain (which we'll discuss later in this chapter).