Infrastructure Services Administrationintermediate
Match each `nslookup` command to the type of DNS resolution it performs.
Answer
nslookup mail.example.com - Forward lookup resolving a hostname to an IP address, nslookup 192.168.1.25 - Reverse lookup resolving an IP address to a hostname, nslookup -type=CNAME www.example.com - Querying an alias record to find the canonical domain name, nslookup -type=MX example.com - Querying mail exchange records to identify responsible mail servers
Explanation
The query form indicates what is being tested. A named host or alias is a forward lookup. An IP address is used for reverse lookup and should be checked against PTR data. The lab does not create a `www1` record, so querying it tests whether students can recognize a missing record rather than assuming every similar-looking name exists. **Key takeaway:** Interpret each command based on its input and compare that input with the records created.\n\n**Glossary:** **Alias**: A name that refers to another DNS name. **PTR record**: Reverse mapping from an IP address to a name. **Missing record**: DNS data that was not configured in the zone.
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