In this article we will discuss Domain Name Server, will make brief discussion on Domain Name Server, In last article we discuss about Cisco Move to CCNA 200-301.
Domain Name Servers (DNS) are the Internet’s equivalent of a phone book. They maintain a directory of domain names and translate them to Internet Protocol (IP) addresses. This is necessary because, although domain names are easy for people to remember, computers or machines, access websites based on IP addresses.
DNS is the glue that makes the web work. It translates a name (www.ccnaeducation.com) to an IP address that tells which web server is hosting the website. It also tells other email servers where to send email for a domain name using what is called the MX record.
In data networks, devices are labeled with numeric IP addresses to send and receive data over networks. Domain names were created to convert the numeric address into a simple, recognizable name.
The DNS protocol defines an automated service that matches resource names with the required numeric network address. It includes the format for queries, responses, and data. The DNS protocol communications use a single format called a message. This message format is used for all types of client queries and server responses, error messages, and the transfer of resource record information between servers.