87 lines
5.9 KiB
HTML
87 lines
5.9 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Domain Name System concepts" />
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<meta name="abstract" content="This topic explains what Domain Name System (DNS) is and how it works. It also shows the different types of zones that can be defined on a DNS server." />
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<meta name="description" content="This topic explains what Domain Name System (DNS) is and how it works. It also shows the different types of zones that can be defined on a DNS server." />
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<meta name="DC.Relation" scheme="URI" content="rzakkkickoff.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzakkconceptbasic.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzakkconceptquery.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzakkconceptdomainisp.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzakkconceptdynamic.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzakkconceptbind.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzakkconceptresourcerec.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2004, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2004, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzakkconceptparent" />
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<meta name="DC.Language" content="en-us" />
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Domain Name System concepts</title>
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</head>
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<body id="rzakkconceptparent"><a name="rzakkconceptparent"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Domain Name System concepts</h1>
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<div><p>This topic explains what Domain Name System (DNS) is and how it
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works. It also shows the different types of zones that can be defined on a
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DNS server.</p>
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<p>Domain Name System (DNS) is a distributed database system for managing
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host names and their associated Internet Protocol (IP) addresses. Using DNS
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means that people can use simple names, such as www.jkltoys.com, to locate
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a host, rather than using the IP address (xxx.xxx.xxx.xxx). A single server
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might only be responsible for knowing the host names and IP addresses for
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a small subset of a zone, but DNS servers can work together to map all domain
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names to their IP addresses. DNS servers working together is what allows computers
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to communicate across the Internet.</p>
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<p>DNS data is broken up into a hierarchy of domains. Servers are responsible
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to know only a small portion of data, such as a single subdomain. The portion
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of a domain for which the server is directly responsible is called a zone.
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A DNS server that has complete host information and data for a zone is authoritative
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for the zone. An authoritative server can answer queries about hosts in its
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zone, using its own resource records. The query process depends on a number
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of factors. Understanding DNS queries explains the paths a client can use
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to resolve a query.</p>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rzakkconceptbasic.htm">Understanding zones</a></strong><br />
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This topic explains Domain Name System (DNS) zones and zone types.</li>
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<li class="ulchildlink"><strong><a href="rzakkconceptquery.htm">Understanding Domain Name System queries</a></strong><br />
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This topic explains how Domain Name System (DNS) resolves queries on behalf of clients.</li>
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<li class="ulchildlink"><strong><a href="rzakkconceptdomainisp.htm">Domain Name System domain setup</a></strong><br />
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This topic provides an overview of domain registration, with links to other reference sites for setting up your own domain space.</li>
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<li class="ulchildlink"><strong><a href="rzakkconceptdynamic.htm">Dynamic updates</a></strong><br />
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OS/400<sup>®</sup> V5R1
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DNS based on BIND 8 supports dynamic updates. These allow outside sources,
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such as Dynamic Host Configuration Protocol (DHCP), to send updates to the
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Domain Name System (DNS) server.</li>
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<li class="ulchildlink"><strong><a href="rzakkconceptbind.htm">BIND 8 features</a></strong><br />
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Besides dynamic updates, BIND 8 offers several features to enhance performance of your Domain Name System (DNS) server.</li>
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<li class="ulchildlink"><strong><a href="rzakkconceptresourcerec.htm">Domain Name System resource records</a></strong><br />
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This topic explains how resource records are used by Domain Name
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System (DNS). Resource records are used to store data about domain names and
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IP addresses. This topic contains a searchable list of resource records supported
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for OS/400<sup>®</sup> V5R1.</li>
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<li class="ulchildlink"><strong><a href="rzakkmailmx.htm">Mail and Mail Exchanger records</a></strong><br />
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Domain Name System (DNS) supports advanced mail routing through the use of Mail and Mail Exchanger (MX) records.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzakkkickoff.htm" title="Domain Name System (DNS) is a distributed database system for managing host names and their associated Internet Protocol (IP) addresses.">Domain Name System</a></div>
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</div>
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</div>
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</body>
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</html>
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