Which name server does not contain any zone information?

Which name server does not contain any zone information?

• A. Primary name server
• B. Secondary name server
• C. Cache-only name server
• D. Recursive name server

Answer: (C)

In DNS, zone information refers to the actual data that defines a domain’s records, which is stored in authoritative servers as zone files. A cache-only name server does not have any zone files and does not participate in hosting or transferring zone data. It simply caches responses it has seen from other servers to speed up future queries. It doesn’t hold authoritative information for any zone, making it the one that contains no zone information at all. In contrast, primary and secondary servers explicitly store zone data (the master copy and replicated copies), and a recursive resolver focuses on resolving names by querying other servers and caching results, but it can still rely on those zone data sources and cache them.

In DNS, zone information refers to the actual data that defines a domain’s records, which is stored in authoritative servers as zone files. A cache-only name server does not have any zone files and does not participate in hosting or transferring zone data. It simply caches responses it has seen from other servers to speed up future queries. It doesn’t hold authoritative information for any zone, making it the one that contains no zone information at all. In contrast, primary and secondary servers explicitly store zone data (the master copy and replicated copies), and a recursive resolver focuses on resolving names by querying other servers and caching results, but it can still rely on those zone data sources and cache them.