57.Types of DNS servers

What is DNS?
DNS is called as Domain name system. DNS is name resolution service in Windows
Server 2003 family which rsolves human friendly name (such as Example Web Page)
into IP address(192.168.0.10) DNS is a hirarchical distributed database that contains
resolving of domain name into IP address.

Why DNS?
Because people and applications try to connect the network computer by specifying
name. DNS has superior scalability,security and compatibility with internet.
Different types of DNS servers are:-
1> Primary DNS server:-
A primary DNS server is created when a primary zone is added. It is a DNS server
which holds primary zones for a perticular domain. Primary DNS server acts as the
zone's central point of update. Newly created zones are always this type.


2> Seconday DNS server:-
It is a DNS server hosting a secondary zone is called as secondary DNS server. That
can be any number of secondary servers for a primary. If primary server is down
then a secondary server provides a name resolution in zone until the primary server
is available.

3> Caching only serves:-
This type of DNS servers does not have any zones in it, and purely depends on
caching. They contain the information of what has been cached while resolving
queries.

4> stub servers:-
It is a DNS server hosting a stub zone. This kind of servers has a copy of a zone
containing only a list of the authoritative DNS servers for its master zone.

5> Forwarders:-
Forwarders is the process of resolving external queries using forwarders. It
reduces network traffic on WAN links. It acts as a firewall which provides a
layer of security from external network.

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