Which type does a port become when it receives the best BPDU on a bridge?
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A. B. C. D.D
In a Spanning Tree Protocol (STP) topology, a bridge port can be in one of the following four states:
Root port: This is the port that has the lowest path cost to the root bridge. There can be only one root port per bridge.
Designated port: This is the port that is selected on a segment to forward traffic towards the root bridge. Each segment has only one designated port.
Alternate port: This is the port that is not the designated port on a segment, but is available to be activated if the designated port fails.
Backup port: This is the port that is not the designated port on a segment, but is available to be activated if the current root port fails.
When a bridge receives a BPDU from another bridge, it examines the information in the BPDU to determine whether the other bridge has a better path to the root bridge. If the received BPDU indicates a better path to the root bridge than the one currently being used by the bridge, then the port through which the BPDU was received becomes the new root port.
Therefore, the answer to the given question is D. The port becomes the root port when it receives the best BPDU on a bridge.