The Serial number in the preamble portion of the "SOA" Record in Zone Transfer is crucial as it is used to indicate whether the DNS Zone Data has been updated or modified. By comparing the Serial number with the one stored by the secondary DNS server, it can determine if a zone transfer is necessary to synchronize the data.
The Serial number in the preamble portion of the "SOA" Record in Zone Transfer plays a vital role in determining whether there is a need to transfer the actual Zone Data. If the Serial number has changed, it indicates that the zone data has been updated, and a zone transfer is required to ensure that all DNS servers have the most recent information.
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Zone Transfer
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