In which Spanning-Tree states does a switch port learn MAC addresses? (Select two)

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问题 In which Spanning-Tree states does a switch port learn MAC addresses? (Select two)

选项 A、Blocking
B、Listening
C、Forwarding
D、Learning
E、Relaying

答案C,D

解析 Explanation:
STP uses a couple of port states besides forwarding and blocking.
1. Listening - Listens to incoming Hello messages to ensure that there are no loops, but does not forward traffic. This is an interim state between blocking and forwarding.

2. Learning - Still listens to BPDUs, plus learns MAC addresses from incoming frames. It does not forward traffic. This is an interim state between blocking and forwarding.

3. Disabled - Administratively down.

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In which Spanning-Tree states does a switch port learn MAC addresses? (Select two)

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