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To resolve host names to IP address eg wiki.answers.com to 192.41.64.63 or YourComputerName to 192.168.1.XX

If it wasnt for this to access a website you would need to type the IP address of the site or to access a share on a computer in stead of typing \\computername you would need to type the computer IP

DNS also does the opposite IP to Hostname so you can do a lookup on an IP address and find out the hostname

for example if you go in to command promt and do tracert yourcompIP it will say tracing route of YourCOmputer Name [YourCOmputerIP]

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Q: What is the working principle of DNS server?
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What is the difference between a preferred DNS server and an altenate DNS server?

What is the difference between a preferred DNS server and an altenate DNS server?Read more: http://wiki.answers.com/What_is_the_difference_between_a_preferred_DNS_server_and_an_altenate_DNS_server#ixzz2LRd3ICed


What are authoritative dns server and none authoritative dns server?

authoritative dns server is server that has own databases that has name resolution for the clients that for resolve from name to ip address and for ip address to name. non-authorititative dns server is server that forward request of dns client to authoritative dns server for resolve.


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What is primary DNS server?

The primary DNS server is usually the same as the router's IP adress.


When would a dns server contact a root server?

If a DNS server cannot find the answer to the DNS Query in its own database it will first query the forwarders (if there are any configured) and then ask the root server. root servers (by default) are the master DNS servers of the Internet.


What is the DNS server in which changes are made for a particular zone and then propagated to other DNS servers?

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Where can one learn what is a DNS server?

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What is the process by which one DNS server sends a name resolution request to another DNS server?

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What program is the DNS server?

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