How a DNS works - Simple Example
* A User opens a web browser and tries to connect to www.google.com. The operating system not knowing the IP Address for www.google.com, asks the ISPs DNS Server for this information.
* The ISPs DNS Server does not know this information, so it connects to a Root Server to find out what name server, running somewhere in the world, to know the information about google.com.
* The Root Server tells the ISP's DNS Server to contact a particular name server that knows the information about google.com.
* The ISPs DNS Server connects to Googles DNS server and asks for the IP Address for www.google.com.
* Googles DNS Server responds to the ISPs DNS server with the appropriate IP Address.
* The ISPs DNS Server tells the Users operating system the IP Address for google.com.
* The operating system tells the Web Browser the IP Address for www.google.com.
* The web browser connects and starts communication with www.google.com.