单项选择题
A.Broadcast frames are never sent to swiches.
B.Broadcast addresses use an incorrect format for the switching table.
C.A broadcast address will never be the source address of a frame.
D.Broadcasts only use network layer addressing.
E.A broadcast frame is never forwarded by aswitch.
单项选择题 As witch is configured as a vtp sever with a domain name of CCNA.Which cisco ios privileged mode command，followed by a reload of the swith，will reset the VTP management domain name of the switch to a NULL value？（）
单项选择题 根据以下的配置，请判断当主接口serial0出故障后，哪一个备份接口最先被启用？（）[Quidway-Serial0]standby interface serial 1 30[Quidway-Serial0]standby interface serial 2 40[Quidway-Serial0]standby logic-channel 3 50[Quidway-Serial0]standby logic-channel 2 35
单项选择题 访问控制列表配置中，操作符“greater-than portnumber”表示控制的是（）。