About DNS
You might not be familiar with DNS, but if you've ever surfed the Internet, you've made extensive use of it. Computers know how to find each other by means of their addresses, and specifically by an IP address, just as you can (usually) find the book store after looking up its address in the phone book. DNS is to computers what the phone book is to you. You don't remember Internet sites by their IP addresses, but by their names. But you don't know where the FOOBAZ bookstore is if you've never been there (or seen it in passing), so you need to look up the address. Similarly, when you want your Web browser to find http://www.calderasystems.com, your system uses DNS to look up the IP address.
On your Linux system you have resolver libraries ...
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