D-Link DES-3326S - Switch - Stackable Uživatelská příručka stáhnout pdf (Strana 105)

DES-3326S Layer 3 Fast Ethernet Switch User’s Guide

Switch Management and Operating Concepts 105

The Domain Name System

Computer users usually prefer to use text names for computers

they may want to open a connection with. Computers

themselves, require 32 bit IP addresses. Somewhere, a

database of network devices’ text names and their

corresponding IP addresses must be maintained.

The Domain Name System (DNS) is used to map names to IP

addresses throughout the Internet and has been adapted for

use within intranets.

For two DNS servers to communicate across different subnets,

the DNS Relay of the DES-3326S must be used. The DNS

servers are identified by IP addresses.

Mapping Domain Names to Addresses

Name-to-address translation is performed by a program called

a Name server. The client program is called a Name resolver.

A Name resolver may need to contact several Name servers to

translate a name to an address.

The Domain Name System (DNS) servers are organized in a

somewhat hierarchical fashion. A single server often holds

names for a single network, which is connected to a root DNS

server – usually maintained by an ISP.

Domain Name Resolution

The domain name system can be used by contacting the name

servers one at a time, or by asking the domain name system to

do the complete name translation. The client makes a query

containing the name, the type of answer required, and a code

specifying whether the domain name system should do the

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D-Link DES-3326S - Switch - Stackable Uživatelská příručka Strana 105