Question 270
At a design studio in Berlin, engineers report that a temporary lab bridge takes over root selection from an access-port connection. The work affects wireless workstations and video conferences. What evidence should the engineer request after the repair?
Explanation
Correct Answer
This observation tests the Layer-two edge protection and BPDU controls requirement at a design studio in Berlin. 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 temporary lab bridge takes over root selection from an access-port connection.
Incorrect Answers
At a design studio in Berlin, the observation may be useful for a separate LACP aggregation and member consistency test, but it does not establish that a temporary lab bridge takes over root selection from an access-port connection has been resolved. The relevant check is the Layer-two edge protection and BPDU controls outcome.
At a design studio in Berlin, this measures a different network requirement, VLAN trunk and native VLAN consistency. The case describes that a temporary lab bridge takes over root selection from an access-port connection, so accepting this result would leave the primary fault without direct verification.
At a design studio in Berlin, 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.