What is Domain Name System ?

DNS is a internet directory which contain name(such as host/website/name space)  information and IP address  DNS Stand for Domain Name System.

DNS -> Domain Name System

             Domain Name Server(maintain)

             Domain Name  Services(enable)

when we install  any component first services will be enables Server manage DNS  Services.

DNS Fundamental  Terms ->

1>Host Name :-  Host Name  is name of computer .it can be up to 255 character.

2>Name Space:- Name Space is a logical set of host signified by a name controlled by a set of name  server.this is equivalent to computer last name.                                     

3>FQDN   :-    FQDN Stand for Fully Qualified Domain Name. Host name append in a domain name is                           called FQDN.Such as   Server name(Server-1)  Domain name (Delhi.com)

                         Hence Server-1.delhi.com is a FQDN  Server.

Name Server:- Name Server  resolve  request  from the name space from dns  client through network.

Host File  :-       Host file is a text file that statically maps hostname to  IP address.

Recursion :-      It is a  server  directed process to resolve FQDN. If the server cannot resolve the                                       FQDN  with its own information .it will send query to other name server. The                                           Recursion process  comprise root  server and domain name server.                        

Zone :-             Zone is a text .file(notepad).It is a internet directory of DNS. Zone are utilized for feed                             information Such as site name & IP Address.

SOA :-             SOA Stand for Start of  Authority .when we  create DNS that time a zone automatically                              generate  and DNS authority also called SOA .It contain name server(hostname ,sites                              name  space) A or AAAA(IPv6)C Name(Canonian/Alias-> netg.com)

                        mx record(Microsoft exchange record).

Forward lookup zone:- It resolve host name to IP  address .

Reverse  lookup zone:- It resolve IP  address to host name .

Stub Zone :-   If  didn't  create any zone then all server  will store in stub zone.

Service Record  :- Service record (Srvs) are record within a DNS Name space to resolve a services to                                  host file. This is a essential part of DNS Supporting Active Directory.

 Note:- Host, website and name space are  same.

primary zone ->only read/write

Secondary zone -> only read

Troubleshooting of DNS

1>Go to run and type cmd.

2>type nslookup.

3>give website name.

4>if IP shows it means dns resolved .

5>ipconfig/flushdns  for delete all entry from dns buffer.