An administrator observes that on Switch A, one of its ports connected to Switch B is in the forwarding state and has the lowest path cost to the root bridge compared to the other ports on Switch A. What is the role of this port in the Spanning Tree topology?
Root port
Alternate port
Designated port
Backup port
The port on Switch A with the lowest path cost to the root bridge is called the root port. It is the port that provides the best path (lowest cost) to the root bridge and is always in the forwarding state. Designated ports are ports designated to forward frames on a LAN segment; they are also in the forwarding state but are determined per segment based on the lowest path cost to the root bridge from that segment. Alternate ports are in a blocking or discarding state and provide an alternate path to the root bridge in case the current path fails. Backup ports are also in a blocking state and provide a backup path on a network segment where two ports of the same switch are connected. Therefore, the correct role of the port is the root port.
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