Managing DNS
When implementing DNS on your network, you need to choose at least one server to be responsible for maintaining your domain. This is referred to as your primary name server, and it gets all the information about the zones it is responsible for from local files. Any changes you make to your domain are made on this server.
Many networks also have at least one more server as a backup, or secondary name server. If something happens to your primary server, this machine can continue to service requests. The secondary server gets its information from the primary server's zone file. When this exchange of information takes place, it is referred to as a zone transfer.
A third type of server is called a caching-only server. A cache is part ...
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