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Chapter 2. How Does DNS Work?
" . . . and what is the use of a
book," thought Alice, "without
pictures or conversations?"
The Domain Name System is basically a database of host information.
Admittedly, you get a lot with that: funny dotted names, networked
name servers, a shadowy
"namespace." But keep in mind that,
in the end, the service DNS provides is information about internet
hosts.We've already covered some important aspects of DNS,
including its client/server architecture and the structure of the DNS
database. However, we haven't gone into much detail,
and we haven't explained the nuts and bolts of
DNS's operation.In this chapter, we'll explain and illustrate the
mechanisms that make DNS work. We'll also introduce
the terms you'll need to know to read the rest of
the book (and to converse intelligently with your fellow zone
administrators).First, though, let's take a more detailed look at
the concepts introduced in the previous chapter.
We'll try to add enough detail to spice it up a
little.
