Infrastructure Services Administrationintermediate
In DNS testing, querying for records that were deliberately not configured in a zone verifies that the DNS server correctly returns negative responses for absent data.
Answer
True
Explanation
The lab creates the zone-apex record, the `webserver` host record, and the `www` CNAME. It does not create `www1.acme.local` or a record for `10.10.10.40`. Querying these values checks whether students can distinguish configured data from absent data. A DNS response indicating no matching record is expected when the requested name or reverse mapping has not been added. **Key takeaway:** Negative test cases help verify that troubleshooting is based on the zone contents rather than assumptions.\n\n**Glossary:** **CNAME**: An alias record. **PTR**: A reverse DNS record. **Negative answer**: A DNS response that the requested data is not available.
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