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) network, the ports on a bridge switch go through a series of states before they become fully operational. The bridge elects one of its ports as the root port, which is the port with the best path to the root bridge. Each non-root bridge also elects a designated port on each segment, which is the port that forwards traffic towards the root bridge. The designated port is the one that has the lowest root path cost to the root bridge.
When a switch receives a BPDU (Bridge Protocol Data Unit) on a port, it compares the received BPDU with the BPDU that it sends on that port. If the received BPDU has a better path cost to the root bridge, the switch changes the port role to the one that corresponds to that port in the BPDU.
Therefore, if a port receives the best BPDU on a bridge, it will become the designated port, because it now has the lowest path cost to the root bridge on that segment. Answer A, "The designated port," is the correct answer.
The backup port is a non-forwarding port that is ready to become the designated port if the current designated port fails. The alternate port is a port that is blocking and waiting to become a designated port if the current designated port fails. The root port is the port on the bridge that has the lowest path cost to the root bridge.