Which zone file is writable and contains the original zone data?

Which zone file is writable and contains the original zone data?

• A. Secondary zone database
• B. Stub zone
• C. Cache-only zone
• D. Primary zone database

Answer: (D)

The zone that is writable and contains the original data is the primary zone database. This is the master copy of the zone data where updates are made. The primary zone is authoritative for the zone and allows changes to be written directly, which then get replicated to other servers as needed. Secondary zones, by contrast, are read-only copies of the zone data that receive updates from the primary via zone transfers for redundancy and load distribution. Stub zones contain only delegation information (like NS records) to help locate the authoritative servers, not the full zone data. Cache-only zones are used to store recently looked-up records for quick responses and are not authoritative or writable.

The zone that is writable and contains the original data is the primary zone database. This is the master copy of the zone data where updates are made. The primary zone is authoritative for the zone and allows changes to be written directly, which then get replicated to other servers as needed.

Secondary zones, by contrast, are read-only copies of the zone data that receive updates from the primary via zone transfers for redundancy and load distribution. Stub zones contain only delegation information (like NS records) to help locate the authoritative servers, not the full zone data. Cache-only zones are used to store recently looked-up records for quick responses and are not authoritative or writable.