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domain name

13 Mar 2019 National Radio TV of Afghanistan

A fully qualified domain name (FQDN), sometimes also referred to as an absolute domain name,[1] is a domain name

that specifies its exact location in the tree hierarchy of the Domain Name System (DNS). It specifies all domain levels, including the top-level domain and the root zone.[2] A fully qualified domain name is distinguished by its lack of ambiguity: it can be interpreted only in one way.

The DNS root domain is unnamed which is expressed by having an empty label in the DNS hierarchy, resulting in a fully qualified domain name ending with the top-level domain. However, in some cases the full stop (period) character is required at the end of the fully qualified domain name.

In contrast to a domain name that is fully specified, a domain name that does not include the full path of labels up to the DNS root is often called a partially qualified domain name.

Resolution[edit]

Many DNS resolvers process a domain name that contains a dot in any position as being fully qualified or add the final dot needed for the root of the DNS tree. Resolvers process a domain name without a dot as unqualified and automatically append the system’s default domain name and the final dot.[citation needed]

Some applications, such as web browsers, try to resolve the domain name part of a uniform resource locator (URL) if the resolver cannot find the specified domain or if it is clearly not fully qualified by appending frequently used top-level domains and testing the result. Some applications, however, never use trailing dots to indicate absoluteness, because the underlying protocols require the use of FQDNs, such as the Simple Mail Transfer Protocol (SMTP).[4

Original Link: https://rta.org.af/eng/2019/03/13/domain-name/

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