多选题Which three port states are used by RSTP 802.1w？（）AListeningBLearningCForwardingDBlockingEDiscardingFDisabled
多选题
Which three port states are used by RSTP 802.1w？（）
A
Listening
B
Learning
C
Forwarding
D
Blocking
E
Discarding
F
Disabled
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