Secondary Zones
A secondary zone is established to provide redundancy and load balancing for the primary zone. Each copy of the DNS database is read-only, however, because all record keeping is done on the primary zone copy. A single DNS server can contain several zones that are primary and several that are secondary. The zone-creation process is similar to the one outlined in the preceding section on primary zones, but with the difference being that the zone is transferred from an existing primary server.
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