What is the process called for copying DNS zone data from the primary to a secondary DNS server?

What is the process called for copying DNS zone data from the primary to a secondary DNS server?

• A. NXDOMAIN
• B. DNS zone transfer
• C. Caching
• D. Delegation

Answer: (B)

Zone transfer is the process of copying DNS zone data from a primary DNS server to a secondary DNS server to keep both authoritative for a domain. The primary holds the original zone file, and the secondary fetches updates so it can answer queries and provide redundancy. This transfer can be a full transfer (AXFR) of the entire zone or an incremental transfer (IXFR) that only sends changes since the last update. Securing transfers with mechanisms like TSIG is common to prevent unauthorized replication. NXDOMAIN is simply the response indicating that a domain does not exist. Caching refers to storing DNS responses locally to speed up repeated lookups. Delegation involves handing authority for a subdomain to another DNS server, not copying zone data between masters and replicas.

Zone transfer is the process of copying DNS zone data from a primary DNS server to a secondary DNS server to keep both authoritative for a domain. The primary holds the original zone file, and the secondary fetches updates so it can answer queries and provide redundancy. This transfer can be a full transfer (AXFR) of the entire zone or an incremental transfer (IXFR) that only sends changes since the last update. Securing transfers with mechanisms like TSIG is common to prevent unauthorized replication.

NXDOMAIN is simply the response indicating that a domain does not exist. Caching refers to storing DNS responses locally to speed up repeated lookups. Delegation involves handing authority for a subdomain to another DNS server, not copying zone data between masters and replicas.