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2

The original behavior is that slaves periodically perform a check that their zone data is current, based on comparing the SOA SERIAL field, with an interval specified in the SOA REFRESH field. If the slave's local data is old it will trigger a zone transfer (IXFR/AXFR). In addition to this, if the master sends a notify message that will trigger this same ...


0

The second situation you mention is standard DNS behavior, as any resolving server who is not the authoritative source will try and contact the master, or something in between with an authoritative unexpired record (though not the entire domain set unless requested).



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