Question 830
A switch receives BPDUs on an access edge configured with BPDU protection and disables the port. 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: the edge protection is responding to an unexpected bridge on a user-facing port. Examine the evidence before choosing the corrective change.
Incorrect Answers
This would be a reasonable check when a core switch keeps forwarding after a power supply is removed, but a maintenance exercise shows no power fault alarm reaches operations, but is less direct for the issue at hand: the edge protection is responding to an unexpected bridge on a user-facing port.
This would be a reasonable check when a dual-homed server loses access after one LAG member fails because the remaining link has a mismatched VLAN allow list, but is less direct for the issue at hand: the edge protection is responding to an unexpected bridge on a user-facing port.
This would be a reasonable check when a distribution ring loses a link and traffic remains blocked despite alternate Layer 2 connectivity, but is less direct for the issue at hand: the edge protection is responding to an unexpected bridge on a user-facing port.