Types of Name Servers:
There are three types of Name Servers which control the entire
Domain Name System:
Root Name Server – top level server which contains entire DNS tree, maintained by ICANN. There are 13 servers.
Primary/Master Name Server- contains a zone resource records. These records are updatable by domain name holders such as organizations.
Secondary/Slave Name Server – contains a copy of primary server files. This server has no authority to update, but reduce the workload of master server by sharing the queries.