HPE6-A45 Exam - Question 105

The spanning tree protocol (STP) works to prevent loops in network topologies by blocking redundant paths. From the provided exhibit, Switch-4 has two untagged VLAN connections, VLAN 11 on port A1 and VLAN 13 on port A2. Given the priorities set, we need to determine which path will be blocked to break potential loops. The priorities in the Spanning Tree configurations show that Switch-2 prioritizes VLANs 10-11 as 0, and VLANs 12-13 as 1, while Switch-3 does the opposite. This means VLAN 11 on Switch-2 has a lower priority number (0) than VLAN 13 (priority 1). Therefore, A1 will forward traffic as it corresponds with the lower priority path, while A2 will block traffic to prevent loops, since STP always allows the lowest priority path, effectively making the answer B: A1 forwards traffic, and A2 blocks traffic.