An administrator configures a forward lookup zone for `acme.local` containing only an A record for `webserver.acme.local` (10.10.10.10) and a CNAME record pointing `www.acme.local` to `webserver.acme.local`. No reverse lookup zone or other records are created. What is the expected outcome when running `nslookup www1.acme.local` and `nslookup 10.10.10.40` against this server?
Answer
Neither query will return a configured record because neither the hostname www1 nor a PTR record for 10.10.10.40 exists.
Explanation
The lab creates records for the zone apex, `webserver.acme.local`, and the `www` alias. It does not create `www1.acme.local`, nor does it assign `10.10.10.40` to a host record or create a corresponding PTR. A DNS server can answer negatively when no matching record exists; that result does not by itself indicate that the DNS service is broken. **Key takeaway:** Compare a query with the records actually created before judging its response.\n\n**Glossary:** **DNS query**: A request for DNS data. **PTR record**: Reverse mapping from IP address to name. **Negative response**: A DNS reply indicating the requested data was not found.
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