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A DNS zone copy's serial number is only changed when a connection is made to the primary server and a copy action takes place. True or false?
True
False
The given statement is True. A COPY action does not constitute a change to the primary DNS server data and a copy record cannot be written to, but if a copy occurs it is because the DNS zone copy's serial number is lower than the master copy's serial number. The copy's serial number is the same as the master's after the copy, therefore it has changed. Zone transfer comprises a preamble followed by the actual data transfer. The preamble comprises a lookup of the Start of Authority (SOA) resource record for the "zone apex", the node of the DNS namespace that is at the top of the "zone". The fields of this SOA resource record, in particular the "serial number", determine whether the actual data transfer need occur at all. The client compares the serial number of the SOA resource record with the serial number in the last copy of that resource record that it has. If the serial number of the record being transferred is greater, the data in the zone are deemed to have "changed" (in some fashion) and the slave proceeds to request the actual zone data transfer. If the serial numbers are identical, the data in the zone are deemed not to have "changed", and the client may continue to use the copy of the database that it already has, if it has one. https://en.wikipedia.org/wiki/DNSzonetransfer
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