单选题For the following ports， which port is on every bridge in a Spanning Tree Protocol IEEE 802.1w network except the root bridge？（）Aroot portBbackup portCdesignated portDalternate port
单选题
For the following ports， which port is on every bridge in a Spanning Tree Protocol IEEE 802.1w network except the root bridge？（）
A
root port
B
backup port
C
designated port
D
alternate port
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