Definition of DNS
The
acronym DNS comes from the English phrase Domain Name System :
namely,
System Domain Name . It is a method name used to name
the devices that connect to a network through the IP ( Internet
Protocol or Internet Protocol ).
The DNS is responsible for linking information associated with the domain name
assigned
to each team. In this way, it makes the binary identifiers related to the
equipment acquire names that are intelligible to human beings, facilitating
their location in the network .
The DNS
server , in this framework, hosts a database that stores the information
of the domain names. Typically, DNS protocols assign a domain
name to an IP address .
Let's
suppose that the site estoesunejemplo.com is at the IP address 214.25.205.146.
DNS relates
both data, allowing users to reach the IP address in question through
the assigned domain name .
A DNS
system consists of three fundamental elements for its practical operation:
* customers
phase 1 : the program that generates a request to the DNS
server to know which IP address corresponds to a domain
name . This program runs on the user's computer;
* DNS
servers : are responsible for resolving the client's request. If a
recursive server does not find the address requested, it has the possibility to
redirect the request to another server;
* authority
zones : this is a portion of the domain name space for which the DNS
server is responsible, which may have authority over more than one, such as
subdomains.
In everyday
use, the usual thing is that the user does not communicate directly with
the DNS server since the names are resolved by the client's
applications, among which are the browser and the mail client.
