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单选题
When is a switched network that is running the Spanning Tree Protocol considered to be fully converged?()
A

when all switches have the same BID as the root switch

B

when all switches have received the MAC address of each neighboring switch

C

when every enabled switch port has been assigned a unique identifier

D

when every operating switch port is in either the blocking or forwarding state

E

when all switches are in either client, server, or transparent mode


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