单选题How long will a port remain in the listening state by default？（）ADepends on the number of switches in the spanning tree domainB50 secondsC15 secondsDUntil the root directs it to start forwardingE20 secondsFDepends on the pott speed
单选题
How long will a port remain in the listening state by default？（）
A
Depends on the number of switches in the spanning tree domain
B
50 seconds
C
15 seconds
D
Until the root directs it to start forwarding
E
20 seconds
F
Depends on the pott speed
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