5.3 Summary

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While the Domain Name System is not one of our four layers in the model, it is an important part of making the Internet easier to use. Domain names allow end users to use symbolic names for servers instead of numeric Internet Protocol addresses. By adding a service that maps domain names to IP addresses, we can move servers from one Internet connection to another connection without requiring users to manually change their configurations to connect to a server.

If you would like to purchase a domain name for yourself or your
company, you can choose from any number of domain name registrars.

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