Retry: specifies how often a slave should retry a failed zone transfer.Refresh: specifies how often a slave DNS server should perform a zone transfer from the master.Serial: this value is used by the DNS server to verify that the contents of a particular zone file are up-to-date.SOA: specifies the Start of Authority: who the authoritative name server is ( ), the administrator’s contact info (, the sign is replaced by a period) and other related information.It is an alias for the domain name (e.g tecmint.lan) defined in the main configuration file.TTL: specifies the time-to-live of the RR and $TTL directive gives a default TTL for every RR without a specific TTL set.Let’s briefly explain the above zone definition and the parameters.
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