How DNS Resolution Works

What is DNS and why name resolution exists ?

DNS stand for Domain Name Server, we human are very bad at remembering number we are use to remember names, so dns act like phone book directory of internet where DNS convert the domain names into IP address.

What is the dig command and when it is used ?

dig stands for domain information groper, its job is to do DNS troubleshoot. It let you manage domains, what is the IP address and DNS server responding or not.

dig google.com

Understanding dig . NS and root name servers

dig .ns use for showing all the 13 logical root server around the world, this help in finding the TLD (Top Level Domain) like : .com , .org, .in. Root server are the starting point of every DNS server.

dig . NS

Understanding dig com NS and TLD name servers

with the help of this command we can see that who is manging this .com domain. TLD help in finding the authorities server where actual domain is present.

dig com NS

Understanding dig google.com NS and authoritative name servers

Authoritive name server are the actual place where the domain is present with its dns records like:- A , MX,CNAME, etc.