DNS is a service that maps domail names to their IP addresses. Domain names are user-friendly names that identify computers instead of their IP addresses. they are available only to computers using the TCP/IP protocol. They consists of two parts :
-> Host name - Identifies the computer on network
-> Domain name - Identifies the internet site
For example, take the name server1. moneycontrol.com. Here, server 1 refers to the computer and moneycontrol.com is the Domain name. When the entire term is combined, it is called a Fully Qualified Domain Name (FQDN)
DNS consists of multiple domain name servers, which store details about various domain names into their IP addresses. When you enter the domain name or site address into the browser, the DNS requests a domain name server to translate the information into the Ip address of the site. In case a particular server does not contain the information, the DNS forwards the request to the other servers, until it obtains the information. DNS is required for the following networks :
-> For computers belonging to network, which uses Microsoft Windows 2000 or Windows server 2003 domains, DNS has to be configured . DNS and Active Directory works in coordination with each other. Active Directory uses DNS as its locator service. A locator service helps clients to find hosts and services having an unknown location with in a given domain.
-> DNS has to be configured if you want to communicate with computers on your network or access the internet using DNS host names.
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