This takes the form of a tree like structure that resembles the file system structure found on computers.
See Understanding The Domain Name Structure The DNS system consists of many Domain Name servers that together provide the name to IP address mapping for registered devices (usually servers) on the Internet.
The main DNS severs (root servers) are owned and managed by a variety of different organizations, and are located mainly in the USA. Other companies including ISPs have their own DNS servers which are linked to the root servers in a hierarchical fashion providing a distributed system.
The following video explain both the host file and its problems, and the basics of how DNS works.
Usually you don’t need to worry about it as your are automatically assigned the address of the DNS server by your ISP and Home router.
If you are concerned about security then consider using a filtered DNS service like Open DNS.
However small business/home network may need DDNS if they want to provide access to internal resources from across the internet.
To make it easy for people to remember names (host names) are used to identify individual computers on a network.
On early computer networks a simple text file called a hosts file was created that mapped host names to IP addresses.
In the normal case, the DNS receives your request, the DNS responds back to your computer with the then current IP address of your desired destination (
A DNS offers many special features such as the ability to furnish directions to sub-domains .