Domain Name System

What is Domain Name System

Domain name system is a network service that maps domain name with the

respective ip address. It is hard to remember ip address for the human being

,there is no need to remember ip address because dns resolves ip address with

their respective domain name.

 

Domain name system

Type of nameservers

There are different type of nameservers:

1)Authoritative nameserver:

·         An authoritative nameserver holds the actual DNS record for a particular domain.

·         An authoritative nameserver answer the queries for part of the zone only.

·         Primary and secondary nameserver both act as an authoritative name server.

·         Minimum one authoritative nameserver will be present in a zone.

2)Primary nameserver:

·         Primary nameserver is an authoritative name server.

·         Primary nameserver holds the master copy of dns record for a domain.

3)Secondary nameserver:

·         Secondary nameserver is also an authoritative name server.

·         Secondary nameserver sync its zone information with the primary master server.

·          

4)Recursive nameserver:

·         Recursive nameserver is not an authoritative nameserver.

·         Recursive nameserver provides the resolution services.

·         Recursive nameserver stores previous queries answer into its cache for a period of time.

·         When recursive nameserver receives any query it searches from its cache memory.If the query answer not present in ithe cache memory it forwards the query to the authoritative name server.

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