If a DNS response is served from a local cache, this indicates the query was a

If a DNS response is served from a local cache, this indicates the query was a

• A. Iterative
• B. Non-recursive
• C. Recursive
• D. Cache

Answer: (B)

When a DNS response comes from a local cache, the resolver is providing data it already has stored, without needing to contact other servers to resolve the name. That behavior matches a non-recursive query, where the server can return a cached answer immediately rather than performing new lookups or referrals. Caching speeds responses by storing previous answers for a TTL, so repeated lookups can be served quickly from memory. The other idea listed isn’t a type of query used to describe how the response was obtained, and while a recursive resolver can also use cached data, the scenario described focuses on answering from the local cache rather than performing fresh resolution steps.

When a DNS response comes from a local cache, the resolver is providing data it already has stored, without needing to contact other servers to resolve the name. That behavior matches a non-recursive query, where the server can return a cached answer immediately rather than performing new lookups or referrals. Caching speeds responses by storing previous answers for a TTL, so repeated lookups can be served quickly from memory. The other idea listed isn’t a type of query used to describe how the response was obtained, and while a recursive resolver can also use cached data, the scenario described focuses on answering from the local cache rather than performing fresh resolution steps.