Question 980
A campus VLAN can reach its gateway but cannot access an internet SaaS site although neighboring VLANs can. Which first diagnostic check is most useful before changing the network?
Explanation
Correct Answer
This check collects evidence at the layer implicated by the symptom: local gateway success does not verify downstream routed, policy or name-resolution service. Examine the evidence before choosing the corrective change.
Incorrect Answers
This would be a reasonable check when a wired client reports no network access, and a technician wants to replace the core router before inspecting the local port, but is less direct for the issue at hand: local gateway success does not verify downstream routed, policy or name-resolution service.
This would be a reasonable check when a single client cannot reach a printer even though other clients in the same VLAN succeed, but is less direct for the issue at hand: local gateway success does not verify downstream routed, policy or name-resolution service.
This would be a reasonable check when voice handsets lose calls only after crossing between two APs, while stationary calls remain stable, but is less direct for the issue at hand: local gateway success does not verify downstream routed, policy or name-resolution service.