多项选择题
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 portatates are blocking,discarding,learing,orforwarding.
D.RSTP also uses the STP proprsal-agreement sequence.
E.RSTP use the same timer-baseed process as STP on point-to-point links.
F.RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.
单项选择题 During startup, the router displays the following error message: boot: cannot open "flash:" What will the router do next（）。
单项选择题 What is valid reason for a switch to deny port access to new devices when port security is enabled?（）
单项选择题 What does the "Inside Global" address represent in the configuration of NAT（）。