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Making Sense of DNS

Mar 23, 2010, 18:03 (0 Talkback[s])

[ Thanks to Andrew Weber for this link. ]

"Originally, users of the Internet, when it was still known as ARPAnet, were forced to use a hosts file called HOSTS.TXT which did the conversion of the IP Address (like 192.168.2.34) to a host (like mail.example.org) by downloading a large file from a central location that listed all of the hosts on the Internet and their IP Addresses. As the network grew, this soon became a situation that could not continue based on the sheer size and the rapid growth of the Internet. Domain Name Service (DNS) was created in 1983 out of the necessity to convert IP Addresses like 192.168.9.2 to domain names like example.com. DNS is a distributed database, what this means is that no one computer is used to maintain a complete database of all of the domains on the Internet. Instead this information is distributed across many computers. To further understand how this works, take a look at the DNS structure:

"Notice how the DNS namespace resembles an inverted tree. The top node, symbolized by a single dot, is known as the root. Below the root, you have the top-level domains like: com, net, org, mil, gov, etc. There are many top-level domains and now even international domains so the number is almost unlimited for top-level domains."

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