SOA: Start of Authority (SOA) defines the zone name, an e-mail contact and various time and refresh values applicable to the zone. For SOA configuration navigate to following path:
Click on DNS link and then click on SOA record tab to view SOA records.
Refresh Interval: Enter the refresh period, i.e. the frequency with which the data should be checked by a secondary name server.
Retry Interval: The retry period, i.e. how often a failed attempt to connect should be retried.
Expire Interval: How soon the data should expire if it hasn't been refreshed.
TTL: The default minimal Time To Live (TTL) of the data.
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