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More About Domain Names
A domain name is the unique name of a
computer on the Internet that distinguishes it from the
other systems on the network.
Every website, email account, etc, on the Internet is hosted
on at least one computer (server). Each server has a unique
IP address which is nothing but a set of numbers, such as
"207.142.131.235". To access a particular internet service,
one can specify its IP address in an appropriate
application, such as an FTP client; however because it is
difficult to remember numbers, an IP address can be
associated with a fully qualified host name (a domain name),
such as "www.yourcompany.com". Domain names also provide a
persistent address for some service when it is necessary to
move to a different server, which would have a different IP
address.
Each set of letters and numbers between the dots is called a
label in parlance of the domain name service (DNS). There
are some rules about the size and make up of labels. Each
must start with a letter or number, and then may be made up
of letters, numbers, and hyphens, to a maximum of 63
characters. These are the rules imposed by the way names are
looked up ("resolved") by DNS. Some top level domains (see
below) impose more rules, like a minimum length, on some
labels. Fully qualified names are sometimes written with a
final dot.
Translating numeric addresses to alphabetical ones, domain
names allow Internet users to localize and visit websites.
Additionally since more than one IP address can be assigned
to a domain name, and more than one domain name assigned to
an IP address, one server can have multiple roles, and one
role can be spread among multiple servers.
Article from:
http://www.findhere.info
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