BIND DNS is open source widely using DNS in the world. DNS (domain name system) converts machine name or url to the IP addresses and IP addresses to it's machine name or url.
Caching Server
The Caching-only DNS server does not contain zone information or a zone database file. The Caching-only server only contains information based on the results of queries that it has already performed. In this case, the cache takes the place of the zone database file. These Caching-only DNS Servers can be set up quickly, and are an important ally in your network and Internet security design.
All DNS servers have a cache.dns file that contains the IP addresses of all Internet root servers....
