多选题Under which two circumstances would an RSTP bridge flush its CAM table？（）Aupon a port state changeBupon receiving a topology change notificationCwhen transitioning from discarding to forwardingDwhen transitioning from forwarding to discardingEonly when changing from listening to discardingFwhen CAM resources have been completely used up
多选题
Under which two circumstances would an RSTP bridge flush its CAM table？（）
A
upon a port state change
B
upon receiving a topology change notification
C
when transitioning from discarding to forwarding
D
when transitioning from forwarding to discarding
E
only when changing from listening to discarding
F
when CAM resources have been completely used up
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