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Lesson 3. Using Network Services > Domain Name System

Domain Name System

DNS is the method Internet computers use to map IP addresses to domain names. Computers use IP addresses to locate one another, but they are not easy for people to commit to memory. Domain names, such as www.apple.com or train.apple.com, are much easier to remember, but they need to be translated into the IP addresses that computers use. DNS performs this translation.

DNS Basics

Here's a simple example for understanding DNS. Imagine a user who wants to access a website such as Apple's training site. That user is connected to the appropriate server for Apple's training department by entering http://train.apple.com in a browser. Behind the scenes, the graphic on the following page depicts what is actually happening on the Internet to make this connection occur.


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