A.端口號小于此數(shù)字的服務(wù)
B.端口號大于此數(shù)字的服務(wù)
C.端口號等于此數(shù)字的服務(wù)
D.端口號不等于此數(shù)字的服務(wù)

A.鏈路空閑時間
B.忙端口的空閑時間
C.鏈路斷開時間
D.端口數(shù)據(jù)可以發(fā)送等待時間

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.電話線到NT1的接口
B.NT1到終端的接口
C.交換機(jī)到用戶板的接口

A.收發(fā)傳真
B.用戶數(shù)據(jù)通道
C.傳送話音
D.傳送同步信號
E.傳送信令

A.2B+D
B.30B+D
C.同軸電纜
D.普通電話線

A.link bandwidth
B.hop count
C.link cost
D.administrative distance
E.link delay

A.主機(jī)地址
B.網(wǎng)絡(luò)地址
C.組播地址
D.廣播地址

A.255.255.255.0
B.255.255.255.128
C.255.255.255.192
D.255.255.255.224