Certification Summary

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Networking services are an integral part of Red Hat Enterprise Linux. DNS, NFS, DHCP, and NTP are a few of the services that you can configure for this operating system.

DNS provides a database of domain names and IP addresses that help Web browsers and more find sites on the Internet. It's a distributed database, where each administrator is responsible for his or her own zone of authority. The diagnostic tool for DNS is now dig. You can also use the more traditional nslookup command, but it has been deprecated.

NFS allows you to share filesystems between Linux and Unix computers. This is a powerful method of controlling data and distributing I/O load, but there are many security concerns involved with its use. Be careful when setting up an NFS share on an unprotected network.

DHCP allows a network administrator to manage IP address assignments of the computers on a LAN from a centralized server. DHCP requires some specialized setup on both the client and the server; however, it is easy to maintain once it is configured.

NTP allows you to set up any computer to be synchronized to a central time standard, based on UTC.

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