novell.com/linux/
Because URLs and web browsing are not this chapter??™s focus, let??™s just quickly review them
so that we can get into DNS in more detail. First is the protocol that you will be using,
which is HTTP (Hypertext Transfer Protocol).
HTTP is nothing more than a protocol that is used to transmit files over the World Wide
Web (WWW) using port 80. The entry www.novell.com is a fully qualified domain name,
or FQDN. An FQDN consists of a host, a domain name, and a top-level domain (TLD).
These are all shown in the URL www.novell.com. In this example, www is the host (this
entry is not always required), novell is the second-level domain, and the .com is the TLD.
Although it??™s not seen, a period also follows .com, which would make the FQDN appear
as www.novell.com. The trailing period shows the root. You do not have to add this
period, but it??™s okay if you do. Most people don??™t even know that it exists. Some browsers
append the entry, and some ignore it; either way, it works.
TLDs are explained as follows. In Figure 27.4, you can see a few TLDs with second-level
domains following.
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