Primary DNS vs Scondary DNS

What is DNS

• The Domain Name System is a distributed database with hierarchical structure and serve the basis for name resolution process in TCP/IP network.
• Domain Name System (DNS) converts the name of a Web site (www.google.com) to an IP address (65.115.71.34) and vice-versa.
• This IP is the IP address of a Web site's server, not the Web site's name, and is used in routing traffic over the Internet.

Primary DNS

• A primary DNS server is responsible for reading data related to the domain zone. The primary server is also responsible for communicating with the secondary server.

Secondary DNS

• A secondary DNS server, also commonly referred to as a slave server, is responsible for obtaining zone data from the primary DNS server immediately after being set up.
• Each time a secondary DNS server functions it receives information from the primary DNS server.

Primary DNS vs Scondary DNS

Primary DNS	Secondary DNS
DNS query is sent, it first reaches the Primary DNS.	Primary DNS unlike, DNS query is sent to Secondary DNS.
It creates, maintains, and updates the information.	It gets its information from a Primary DNS.
You can only have one Primary DNS server.	You can have an unlimited number of Secondary DNS servers.
Primary DNS server is read/write copy of the DNS database.	Secondary DNS server is used for the purpose of backup.