Question 280
During a planned campus-network change at a public library in Portland, operators discover that a switch is repeatedly connected and disconnected from a workstation port, creating topology churn. The design must preserve staff and visitor wireless access. Which test result most directly confirms the required behavior?
Explanation
Correct Answer
This observation tests the Layer-two edge protection and BPDU controls requirement at a public library in Portland. The expected result is that endpoint ports avoid introducing a bridge loop while legitimate inter-switch links continue exchanging BPDUs normally. The necessary correction is to apply appropriate edge-port STP protections and restrict unapproved downstream switching devices without blocking intended uplinks; a saved configuration alone would not prove it is working. In this case, the observed fault is that a switch is repeatedly connected and disconnected from a workstation port, creating topology churn.
Incorrect Answers
At a public library in Portland, the observation may be useful for a separate VLAN trunk and native VLAN consistency test, but it does not establish that a switch is repeatedly connected and disconnected from a workstation port, creating topology churn has been resolved. The relevant check is the Layer-two edge protection and BPDU controls outcome.
At a public library in Portland, this measures a different network requirement, Ingress ACL enforcement and least privilege. The case describes that a switch is repeatedly connected and disconnected from a workstation port, creating topology churn, so accepting this result would leave the primary fault without direct verification.
At a public library in Portland, this would verify DHCP snooping and rogue DHCP protection, not the failure reported in this scenario. The requested closure criterion instead concerns Layer-two edge protection and BPDU controls: endpoint ports avoid introducing a bridge loop while legitimate inter-switch links continue exchanging BPDUs normally.