Chapter 10. Domain Name Service (DNS)

DNS is chiefly responsible for mapping (converting) hostnames to Internet addresses. Sounds simple enough, but there is more to it than that.

A lot of people don't really like to work with numbers—except for mathematicians and engineers, I suppose. But for the rest of us, pseudonyms are preferred. For example, to get to the Web site of the White House, would you rather specify http://www.whitehouse.gov or 198.137.240.91? You might know the dotted address now, but by tomorrow you will have forgotten it. Even if you could remember that IP address, just how many can you memorize?

Enter the Domain Name System, sometimes called Domain Name Service. To reduce confusion, let's just call it DNS. DNS provides two types ...

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