Premium Essay

Dns Role Server

In: Computers and Technology

Submitted By MsMane
Words 3463
Pages 14
DNS Server Role
Updated: January 21, 2008

Domain Name System (DNS) is a system for naming computers and network services that is organized into a hierarchy of domains. TCP/IP networks, such as the Internet, use DNS to locate computers and services through user-friendly names.

To make using network resources easier, name systems such as DNS provide a way to map the user-friendly name for a computer or service to other information that is associated with that name, such as an IP address. A user-friendly name is easier to learn and remember than the numeric addresses that computers use to communicate over a network. Most people prefer to use a user-friendly name—for example, sales.fabrikam.com—to locate an e-mail server or Web server on a network rather than an IP address, such as 157.60.0.1. When a user enters a user-friendly DNS name in an application, DNS services resolve the name to its numeric address.

What does a DNS server do?
A DNS server provides name resolution for TCP/IP-based networks. That is, it makes it possible for users of client computers to use names rather than numeric IP addresses to identify remote hosts. A client computer sends the name of a remote host to a DNS server, which responds with the corresponding IP address. The client computer can then send messages directly to the remote host's IP address. If the DNS server does not have an entry in its database for the remote host, it can respond to the client with the address of a DNS server that is more likely to have information about that remote host, or it can query the other DNS server itself. This process can take place recursively until either the client computer receives the IP address or it is established that the queried name does not belong to a host within the specific DNS namespace.

The DNS server in the Windows Server® 2008 operating system complies with the set of...

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