A client resolves `webserver.acme.local` to `10.10.10.30`, but a connectivity test to that address fails. What can and cannot be concluded?
Answer
The DNS response indicates that the queried DNS service returned a mapping for `webserver.acme.local` to `10.10.10.30`. It does not establish that a device is configured with that address, reachable, or running a service. The lab warns that the sample addresses are not assigned to devices.
Explanation
The DNS lookup and the connectivity test answer different questions. `nslookup` checks the DNS mapping stored or returned by the resolver. A connectivity test checks whether packets can reach an endpoint, and an application test checks whether a particular service responds. In the lab, the addresses are illustrative and not assigned to machines, so a failed connectivity test is consistent with a successful DNS lookup. **Key takeaway:** Separate DNS correctness from IP reachability and service availability.\n\n**Glossary:** **Name resolution**: Translating a name into DNS data such as an IP address. **Endpoint**: A network device or service addressed on a network. **Service availability**: Whether an application responds to requests.
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