Infrastructure Services Administrationintermediate
Which commands from the lab test forward name lookups? Select ALL that apply.
Answer
`nslookup acme.local`, `nslookup webserver.acme.local`, `nslookup www.acme.local`
Explanation
The first three commands query DNS using names in the `acme.local` namespace, so they are forward lookup tests. `nslookup 10.10.10.20` starts with an IP address and tests reverse lookup behavior, normally using PTR data in the reverse zone. Distinguishing the query direction helps identify whether a missing answer relates to a forward record or a reverse record. **Key takeaway:** Queries beginning with DNS names test forward resolution; queries beginning with IP addresses test reverse resolution.\n\n**Glossary:** **Forward lookup**: Resolving a name to DNS data. **Reverse lookup**: Resolving an address to a name. **PTR**: DNS record type used for reverse lookup.
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