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Of course, only key servers and the localhost should be defined in the /etc/hosts file otherwise, any change in IP address for that server will not be reflected in the value resolved from /etc/hosts DNS works on a simple client/server principle: if you know the name of a DNS server for a particular network, you will be able to retrieve the IP address of any host within that network For example, if you know that the name server for the domain paulwatterscom is dns20registercom, you can contact dns20registercom to retrieve the address for any host within the paulwatterscom domain (including wwwpaulwatterscom, or 2096750203) Of course, this leads you to a classic chicken and egg problem how do you know, in the first instance, that the DNS server dns20registercom is authoritative for paulwatters.

com The answer is that, in the same way that the addresses of all hosts under paulwatterscom are managed by its DNS server, the address of the DNS server is managed by the next server along the chain in this case, the DNS server for the com domain There are many such top-level domains now in existence, including the traditional edu (educational organizations), com (commercial organizations), and net (network) top-level domains Most countries now have their own top-level domains, including au (Australia), ck (Cook Islands), and ph (Philippines) Underneath each top-level domain are several second-level domains: for example, Australia has comau (Australian commercial organizations), eduau (Australian educational organizations), and asnau (Australian nonprofit associations) The organizations that manage each top-level and second-level domain can also be quite different: while Network Solutions (http://www nsicom/) is responsible for the wholesale allocation of domain names for the .

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com toplevel domain, the comau second-level domain is managed by Melbourne IT (http://www melbourneitcomau/) As an example, take a look at how the hostname wwwfinancesaltlakecom is resolved: the client resolver needs to determine which DNS server is authoritative for com domains, followed by the DNS server that is authoritative for saltlakecom domains, potentially followed by the DNS server that is authoritative for the financesaltlakecom domain, if all mappings for saltlakecom are not stored on a single server The com resolution is taken care of by the list of root servers provided by the whois database (ftp://ftprsinternicnet/domain/namedroot):.

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>>> Last update of whois database: Mon, 9 Oct 2000 09:43:11 EDT <<< The Registry database contains ONLY .COM, .NET, .ORG, .EDU domains and Registrars. ftp://ftp.rs.internic.net/domain/named.root ; This file holds the information on root name servers needed to ; initialize cache of Internet domain name servers ; (e.g. reference this file in the "cache . <file>" ; configuration file of BIND domain name servers). ; ; This file is made available by InterNIC registration services ; under anonymous FTP as ; file /domain/named.root ; on server FTP.RS.INTERNIC.NET ; -OR- under Gopher at RS.INTERNIC.NET ; under menu InterNIC Registration Services (NSI) ; submenu InterNIC Registration Archives ; file named.root ; ; last update: Aug 22, 1997 ; related version of root zone: 1997082200 . 3600000 IN NS A.ROOT-SERVERS.NET. A.ROOT-SERVERS.NET. 3600000 A 198.41.0.4 . 3600000 NS B.ROOT-SERVERS.NET. B.ROOT-SERVERS.NET. 3600000 A 128.9.0.107 . 3600000 NS C.ROOT-SERVERS.NET. C.ROOT-SERVERS.NET. 3600000 A 192.33.4.12 . 3600000 NS D.ROOT-SERVERS.NET. D.ROOT-SERVERS.NET. 3600000 A 128.8.10.90 . 3600000 NS E.ROOT-SERVERS.NET. E.ROOT-SERVERS.NET. 3600000 A 192.203.230.10 . 3600000 NS F.ROOT-SERVERS.NET. F.ROOT-SERVERS.NET. 3600000 A 192.5.5.241 . 3600000 NS G.ROOT-SERVERS.NET. G.ROOT-SERVERS.NET. 3600000 A 192.112.36.4 . 3600000 NS H.ROOT-SERVERS.NET. H.ROOT-SERVERS.NET. 3600000 A 128.63.2.53 . 3600000 NS I.ROOT-SERVERS.NET. I.ROOT-SERVERS.NET. 3600000 A 192.36.148.17 . 3600000 NS J.ROOT-SERVERS.NET. J.ROOT-SERVERS.NET. 3600000 A 198.41.0.10 . 3600000 NS K.ROOT-SERVERS.NET. K.ROOT-SERVERS.NET. 3600000 A 193.0.14.129 . 3600000 NS L.ROOT-SERVERS.NET. L.ROOT-SERVERS.NET. 3600000 A 198.32.64.12 . 3600000 NS M.ROOT-SERVERS.NET. M.ROOT-SERVERS.NET. 3600000 A 202.12.27.33

The preceding named.root file can be used by servers to resolve IP addresses for root DNS servers, if they do not run a local DNS server. After obtaining an IP address for a root server for the .com domain, a query is then made to the DNS server that is authoritative for saltlake.com for the address www.finance.saltlake.com. Either of two possible scenarios may occur at this point: the DNS server that is authoritative for the entire saltlake.com

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Part VI:

domain can resolve the address, or the query is passed to a DNS server for the finance .saltlake.com domain, if the root server has delegated authority to another server. In the latter situation, the saltlake.com DNS server does not know the IP address for any hosts within the finance.saltlake.com domain, except for the address of the DNS server. DNS is therefore a very flexible system for managing the mapping of domain names to IP addresses. The software that carries out the client request for, and server resolution of, IP addresses is BIND. Although most vendors, including Sun, ship their own customized version of BIND, it is possible to download, compile, configure, and install your own version of BIND (available for download from Internet Systems Consortium at http://www.isc.org/).

The following examples demonstrate how to install and configure DNS client tools and the DNS server.

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