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is the FQDN of a computer named challenger installed at the Advanced Technology Center (ATC) at De Anza College A DNS server can only match an FQDN to an address Note that the name must end with a null label, but because null means nothing, the label ends with a dot ()
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Partially Qualified Domain Name
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If a label is not terminated by a null string, it is called a partially qualified domain name (PQDN) A PQDN starts from a node, but it does not reach the root It is used when the name to be resolved belongs to the same site as the client Here the resolver can supply the missing part, called the suffix, to create an FQDN For example, if a user at the jhdaedu site wants to get the IP address of the challenger computer, he or she can define the partial name
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The DNS client adds the suffix atcjhdaedu before passing the address to the DNS server The DNS client normally holds a list of suffixes The following can be the list of suffixes at De Anza College The null suffix defines nothing This suffix is added when the user defines an FQDN
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DISTRIBUTION OF NAME SPACE
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Figure 254 shows some FQDNs and PQDNs
Figure 254 FQDN and PQDN
FQDN challengeratcfhdaedu cshnunecom wwwfunnyint PQDN chal1engocMcfhdaedll cshmme
Domain
A domain is a subtree of the domain name space The name of the domain is the domain name of the node at the top of the subtree Figure 255 shows some domains Note that a domain may itself be divided into domains (or subdomains as they are sometimes called)
Figure 255 Domains
DISTRIBUTION OF NAME SPACE
The information contained in the domain name space must be stored However, it is very inefficient and also unreliable to have just one computer store such a huge amount of information It is inefficient because responding to requests from all over the world places a heavy load on the system It is not unreliable because any failure makes the data inaccessible
DOMAIN NAME SYSTEM
Hierarchy of Name Servers
The solution to these problems is to distribute the information among many computers called DNS servers One way to do this is to divide the whole space into many domains based on the first level In other words, we let the root stand alone and create as many domains (subtrees) as there are first-level nodes Because a domain created in this way could be very large, DNS allows domains to be divided further into smaller domains (subdomains) Each server can be responsible (authoritative) for either a large or a small domain In other words, we have a hierarchy of servers in the same way that we have a hierarchy of names (see Figure 256)
Figure 256 Hierarchy of name servers
Root server
arpa server
edu server
com server
us server
mcgrawcom
==0 -
irwincom
Zone
Since the complete domain name hierarchy cannot be stored on a single server, it is divided among many servers What a server is responsible for or has authority over is called a zone We can define a zone as a contiguous part of the entire tree If a server accepts responsibility for a domain and does not divide the domain into smaller domains, the domain and the zone refer to the same thing The server makes a database called a zone file and keeps all the information for every node under that domain However, if a server divides its domain into subdomains and delegates part of its authority to other servers, domain and zone refer to different things The information about the nodes in the subdomains is stored in the servers at the lower levels, with the original server keeping some sort of reference to these lower-level servers Of course the original server does not free itself from responsibility totally: It still has a zone, but the detailed information is kept by the lower-level servers (see Figure 257) A server can also divide part of its domain and delegate responsibility but still keep part of the domain for itself In this case, its zone is made of detailed information for the part of the domain that is not delegated and references to those parts that are delegated
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