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While any candidate for the RHCE should already know the basic functions of a DNS server, let's make that functionality explicit. A DNS server resolves hostnames or fully qualified domain names to IP addresses, and assuming the DNS server database is properly configured it can also do the reverse, in other words, it can resolve IP addresses into host names, or Fully Qualified Domain Names. But what is a Fully Qualified Domain Name? Let's take www dot vtc dot com dot for example. Atop the hierarchy is actually the dot. Not dot com, but the dot at the end of the address. We never have to enter it in a Web browser because the dot at the end of the address is assumed, but it's there as part of the Fully Qualified Domain Name. Top level domains such as dot com, dot net, dot org, and so on, are actually subdomains. The top level dot is also known as the root domain. The authoritative DNS servers are distributed in 13 locations worldwide. If you've installed the caching nameserver package you can find this list in the var slash named slash name dot ca configuration file. Each of these 13 servers in the root domain can call upon authoritative DNS servers for dot com, dot net, and so on. Then the authoritative DNS server, or at least one of the authoritative DNS servers, in this case for dot com, can find the authoritative DNS server for the vtc dot com dot domain. And generally, the authoritative DNS server for vtc dot com dot includes the authoritative information for the vtc Web server at www dot vtc dot com. Or, if not, it can at least call up the right DNS server. The standard DNS service for Red Hat Enterprise Linux 5 is the Berkeley Internet Name Domain, also known by its acronym BIND. It's the default DNS server for Red Hat Enterprise Linux 5. While BIND is far from the only domain name service available, it is the default readily available for our operating system. If you're taking the RHCE exam, you will want to learn to configure DNS at least as a slave and a caching nameserver, and we'll do that in the following videos.
| Course: | Red Hat Certified Engineer |
| Author: | Michael Jang |
| SKU: | 33845 |
| ISBN: | 1-934743-47-X |
| Release Date: | 2008-01-18 |
| Duration: | 6.5 hrs / 94 lessons |
| Captions: | No |
| Compatibility: |
Vista/XP/2000, OS X, Linux QuickTime 7, Flash 8 |