Domain Name System (DNS) is a hierarchical or distributed database that contains the mapping of DNS domain names of various types of data ,such as IP addresses .DNS enable the location of computers and services by user-friendly names , and it also enables the discovery of other informations stored in the database.(Microsoft ).Domain Name System (DNS) is the translation of human friendly computer names (such as websites) to computer IP addresses in a way computers understand. Once armed with an IP address, your computer can communicate directly with it’s intended destination.

Authoritative DNS:

Authoritative DNS refers to the servers in the Domain Name System that are responsible for giving the “authoritative” IP address for the domain name you are asking for or telling you where else you should look for that answer. (Comodo).

Recursive DNS:

Recursive DNS refers to the portion of the overall DNS system that, when asked for the IP address of a specific domain name, will get the response. Recursive servers many a times use cached in memory so speed up in browsing.Sometimes it will have to start querying authoritative servers to get the answer.So, recursive server make browsing quick, efficient, and safe manner if proper and secure DNS used like OpenDNS or Comodo Secure DNS and as far as my knowledge goes both are free to use.

To manually configure TCP/IP to use DNS :

1. Open Network Connections.
2. Right-click the network connection you want to configure, and then click Properties.
3. On the General tab (for a local area connection) or the Networking tab (all other connections), click Internet Protocol (TCP/IP), and then click Properties.
4. If you want to obtain DNS server addresses from a DHCP server, click Obtain DNS server address automatically.

If you want to manually configure DNS server addresses,

1. click Use the following DNS server addresses, and in Preferred DNS server and Alternate DNS server, type the preferred DNS server and alternate DNS server IP addresses.
2. Here the concept of Comodo Secure DNS or OpenDNS comes.
3. These manually change in setting may increase yours browsing speed to a great extent and I will be writing some articles in the coming days over these DNS.
4. .As these DNS browsing speeds depends upon their cache and apparently both these services have mammoth cache which ultimately speeds up browsing.Quality of service, security, and reliability of these DNS service providers is of paramount importance.

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