Refer to the exhibit. Which switch will become the root bridge?
Spanning Tree elects the root bridge using the lowest Bridge ID. The Bridge ID is compared by bridge priority first, and when two switches have the same priority, the lower MAC address wins. Here, S2 and S3 both have the lowest priority value of 30000, and S2's MAC address (BB:BB:BB:BB:BB:BB) is lower than S3's (CC:CC:CC:CC:CC:CC), so S2 is elected the root bridge.
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