A.A
B.B
C.C
D.D
E.E
F.F

A.4094
B.1024
C.8190
D.2046
E.4096

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.

A.#vtp domain unset
B.#delete vlan.dat
C.#no vtp domain
D.#vtp domain null

A.serial 1
B.serial 2
C.logic-channel 2
D.logic-channel 3

A.端口号小于此数字的服务
B.端口号大于此数字的服务
C.端口号等于此数字的服务
D.端口号不等于此数字的服务

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

A.收发传真
B.用户数据通道
C.传送话音
D.传送同步信号
E.传送信令