 DNS
Server Role
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?
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.
What's New in DNS in Windows Server 2008
Domain Name System (DNS) is a system that is used in TCP/IP
networks for naming computers and network services that is
organized into a hierarchy of domains. DNS naming locates
computers and services through user-friendly names. When a
user enters a DNS name in an application, DNS services can
resolve the name to other information that is associated with
the name, such as an IP address.
Windows Server® 2008 provides a number of enhancements
to the DNS Server service that improve how DNS performs. For
details about these changes, see DNS
Server Role.
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