in.named and DNS Name Servers

As mentioned previously, name servers in an administrative domain maintain the DNS database. They also run the in.named daemon, which implements DNS services, most significantly, name-to-address mapping. in.named is a public domain TCP/IP program and included with the Solaris 2.6 Solaris 2.6 releaseenvironment.

The in.named daemon is also called the Berkeley Internet Name Domain service, or BIND, because it was developed at the University of California at Berkeley.

There are three types of DNS name servers:

• Primary server

• Secondary server

• Cache-only server

Each domain must have one primary server and should have at least one secondary server to provide backup. "Zones" explains primary and secondary servers in detail.