The incremental Zone Transfer starts when the client initiates the process by sending a query with the specific opcode 0 and query type IXFR (incremental transfer) value 251 over a TCP connection to the server. This query indicates to the server that the client is requesting an incremental transfer of the zone data.
In the incremental Zone Transfer process, the client does not send the "SOA" resource that it currently has to the server. Instead, the client initiates the transfer by sending a query with the opcode and query type specified for incremental transfer. The server then responds to this query with the necessary zone data updates.
Domain
Zone Transfer
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