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Understanding DNS

When a client requests a resource from a web site, it does this via a domain name. In this case, the domain name is ingame.scea.com. However, computers do not communicate using these domain names but instead use an associated numerical address called an IP address. In order for a computer to learn this address, it provides the domain name to a domain name server (DNS), which does a look up in its database and returns the proper IP address.

In this case, the IP address of ingame.scea.com is actually 160.33.44.80 (as of writing this article). Now you might wonder why the client can't simply use a hard coded IP address. Well, the answer is two fold. First, humans would have a tough time trying to remember the number for every web site they want to view. Second, and more importantly, web sites often move from one IP address to another. Therefore, if the client did not know of the change, they would loose contact with the desired resource. In other words, what would happen if Wipeout Pure was hard coded to go to 160.33.44.80 for its download page, but that particular IP address was reassigned to another site, say CNN.com. This would cause the program to break and pandemonium would ensue.

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