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A secondary master DNS server is used to complement a primary master DNS server by serving a copy of the zone(s) configured on the primary server.
Secondary servers are recommended in larger setups.
( Main Configuration File ), for ( Forward Zone ), rev ( Reverse Zone ) to allow the Query and Zone record transfer to Slave Server.
All that is required is simply combining the different configuration examples.
There are also two other common DNS server setups (used when working with zones for registered domain names), Stealth Primary and Stealth Secondary.
I modified the example file to give box an address of 192.168.1.21).
Domain Name Service (DNS) is an Internet service that maps IP addresses and fully qualified domain names (FQDN) to one another.