Work a DNS Failure From Symptom to Boundary

Users on VLAN 20 report that websites fail by name, but existing chat sessions and direct IP tests still work. Hypothesis-driven troubleshooting: observe -> hypothesize -> test -> refine. Treating a name-resolution symptom as a total network outage leads to disruptive device reboots and missed resolver evidence. Observe the symptom precisely Ask what still works: direct IP, existing sessions, internal names, external names, one user or many. This separates perceived outage from the specific operation that is failing. Prove IP connectivity Ping or trace a known IP from the affected VLAN and confirm default gateway reachability. If IP works while…

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