Domain Name System (DNS) is a database system that translates a computer's fully qualified domain name into an IP address. Networked computers use IP addresses to locate and connect to each other, but IP addresses can be difficult for people to remember. For example, on the web, it's much easier to remember the domain name Each organization that maintains a computer network will have at least one server handling DNS queries. That server, called a name server, will hold a list of all the IP addresses within its network, plus a cache of IP addresses for recently accessed computers outside the network. Each computer on each network needs to know the location of only one name server. When your computer requests an IP address, one of three things happens, depending on whether or not the requested IP address is within your local network:
When you use an application such as telnet to connect to another computer, you most likely type in the domain name rather than the IP address of that computer. The telnet application takes the domain name and uses one of the above methods to retrieve its corresponding IP address from the name server. A good analogy is to think of DNS as an electronic telephone book for a computer network. If you know the name of the computer in question, the name server will look up its IP address. Within most Internet applications, you will not see the IP address of the computer to which you're connecting. If you want to find the IP address of a particular computer, refer to the appropriate Knowledge Base document listed below http://faq.domainmonster.com/dns/ns_record/ Google Basic Guide to DNS https://www.google.com/support/a/bin/answer.py?hl=en&answer=48090#I A Record CName http://www.webopedia.com/TERM/C/CNAME.html http://www.domainavenue.com/cname.htm MX-Record http://www.simpledns.com/kb.aspx?kbid=1051 http://www.webopedia.com/TERM/M/MX_record.html NS Record http://www.zytrax.com/books/dns/ch8/ns.html http://faq.domainmonster.com/dns/ns_record/ PTR Record http://aplawrence.com/Blog/B961.html http://wiki.answers.com/Q/What_is_PTR_record SPF Record http://hosting.intermedia.net/support/kb/default.asp?id=1010 SRV Record http://www.petri.co.il/active_directory_srv_records.htm http://www.zytrax.com/books/dns/ch8/srv.html TXT Record http://www.zytrax.com/books/dns/ch8/txt.html Source : http://kb.iu.edu/data/adns.html |
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