Which command would change the topology of the spanning tree?

Changing the topology of the spanning tree involves altering which switches participate in the forwarding and blocking state decisions based on the Spanning Tree Protocol (STP). The command to set a switch as the primary root for a VLAN effectively influences the entire topology by promoting this switch to be prioritized for forwarding traffic over others.

By using the command that specifies a switch as the primary root for a VLAN, you are directly influencing the way STP operates by adjusting the bridge priority. This priority value determines which switch will become the root bridge. The switch with the lowest priority will be elected as the root bridge, thus changing the paths through which data flows across the network. If the command executed results in a new root bridge, all the other devices in the network’s topology will adjust their roles, potentially leading to a completely different spanning tree structure.

The other commands mentioned serve different functions. While they may adjust certain parameters of STP, they do not directly designate a switch as the root, which is what ultimately changes the spanning tree's topology. For example, one command may adjust the rapid spanning tree mode, another could set a cost for the path but wouldn’t affect the root bridge selection, and the last could only change bridge priority but not guarantee a root designation unless