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Chapter 4. Finding What You Need > Domain Name System

Domain Name System

The Domain Name System (DNS) is a collection of computers called DNS servers that keep track of what IP address is assigned to what Web site or domain name.

A domain name identifies one or more IP addresses used to identify a Web site. For example, www.cnn.com is a domain name, and it could have multiple IP addresses tied to that name. In other words, it's easier to remember CNN's domain name of www.cnn.com than its IP address of 64.236.16.20.


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