Which command can you use to verify the MST port cost for instance 1?
- show spanning-tree1
- show spanning tree cost1
- show spanning-tree mst1
- show spanning-tree mst instance1
Explanation: To verify the configuration and operational status of a specific Multiple Spanning Tree (MST) instance, including the port cost and port priority, the correct command is show spanning-tree mst <instance-id>.
In MST, port parameters like cost are not global but are instead configured and maintained per instance. This allows different instances to have different path costs for the same physical interface, enabling load balancing across the network topology. When you issue the command show spanning-tree mst 1, the switch displays a table listing each interface's role, status, cost, and priority number specifically for MST instance 1.
The other options provided are incorrect because they do not follow the standard Cisco IOS syntax for MST verification:
show spanning-tree 1would typically refer to a specific VLAN in a PVST+ environment.- The keywords "cost" and "instance" are not used as standalone arguments in the basic verification command in the manner suggested by the other options.
Related exam: Modules 1 – 7: Checkpoint Exam: Network Switching Answers (CCNP ENCOR v9)
