A network engineer is analyzing the spanning tree configuration on a switch running Rapid PVST+. They observe that one of the switch's interfaces connected to another switch is in a discarding state and is acting as a backup for forwarding data if necessary. What is the role of this port in the Rapid PVST+ spanning tree topology?
It has a misconfigured duplex setting that could cause it to block traffic.
It is in the learning state and may start forwarding traffic.
It is the designated port and forwards traffic on its segment.
It is an alternate port, providing a backup path to the root bridge and blocking traffic to prevent loops.
In Rapid PVST+, a port that is in the discarding state and serves as a backup path to the root bridge is known as an alternate port. The alternate port provides redundancy by being available if the root port fails, but it remains in the discarding state to prevent switching loops. The learning state is a transitional state where the port prepares to forward traffic, but in this scenario, the port is not indicated to be transitioning. A port with a misconfigured duplex setting may cause connectivity issues but does not define a specific spanning tree role or state. A designated port forwards traffic on its segment and would be in the forwarding state, not discarding.
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Cisco CCNA 200-301
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