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Obviously, a server operating system must provide networking capabilities in order for it to function on a network. If your client computers can’t connect to your servers, your network will be useless. For this reason, it’s a good idea to make sure your server computers are equipped with more than one network interface. That way, if one of the interfaces fails, the other can pick up the slack and keep your server connected to your network.

In addition to basic network connectivity, one of your servers will typically be responsible for providing some essential software services that are required to keep a network operating in an efficient manner. One of these is called Dynamic Host Configuration Protocol (DHCP); it’s the service that recognizes computers and other devices that want to join the network, providing each with a unique address so that all the devices on the network can identify one another. For more information about this vital service, refer to Book 2, Chapter 5.

A second basic service that is provided by one of the servers on your network is called Domain Name System (DNS). This service is what enables people to use network names instead of the actual addresses that are handed out by DHCP. It’s also the service that enables people to browse the World Wide Web using addresses such as www.dummies.com rather than cryptic addresses. For more information about this important service, please refer to Book 2, Chapter 6.