单项选择题
A.链路空闲时间 B.忙端口的空闲时间 C.链路断开时间 D.端口数据可以发送等待时间
A.RSTP significantly reduces topology reconverging time after a link failure. B.RSTP expends the STP port roles by adding the alternate and backup roles. C.RSTP port atates are blocking,discarding,learing,orforwarding. D.RSTP also uses the STP proprsal-agreement sequence. E.RSTP use the same timer-baseed processas STP on point-to-pointlinks. F.RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.
A.acl B.dialer enable-circular C.dialer-group D.dialer-rule
A.电话线到NT1的接口 B.NT1到终端的接口 C.交换机到用户板的接口
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