Which DNS operation transfers a complete zone data from master to slave?

Which DNS operation transfers a complete zone data from master to slave?

• A. AXFR
• B. IXFR
• C. NSLOOKUP
• D. A RECORD QUERY

Answer: (A)

Transferring an entire DNS zone from the primary server to a secondary server is done with a full zone transfer. This operation copies all resource records for the zone from the master to the slave, ensuring the secondary has a complete copy of the zone data. The incremental alternative, IXFR, only sends changes since the last transfer, which saves bandwidth when updates are small. NSLOOKUP is a diagnostic tool used to query DNS records and does not perform zone transfers, while querying for an A record retrieves a host’s IP address and is unrelated to transferring zone data.

Transferring an entire DNS zone from the primary server to a secondary server is done with a full zone transfer. This operation copies all resource records for the zone from the master to the slave, ensuring the secondary has a complete copy of the zone data. The incremental alternative, IXFR, only sends changes since the last transfer, which saves bandwidth when updates are small. NSLOOKUP is a diagnostic tool used to query DNS records and does not perform zone transfers, while querying for an A record retrieves a host’s IP address and is unrelated to transferring zone data.