A.中继连接
B.接入链路
C.控制连接
D.分支链路

A.showversion
B.showcommands
C.showprevious
D.showhistory

A.2950（config）#default-gateway192.168.1.254
B.2950（config-iF.#default-gateway192.168.1.254
C.2950（config）#ipdefault-gateway192.168.1.254
D.2950（config-iF.#ipdefault-gateway192.168.1.254

A.使能口令
B.使能密码
C.两者都不能
D.两者都可以

A.255.255.255.128和255.255.255.224
B.255.255.255.128和255.255.255.240
C.255.255.255.192和255.255.255.224
D.255.255.255.192和255.255.255.240

A.网络地址
B.主机地址
C.定向广播地址
D.不定向广播地址

A.119.12.73.214
B.192.32.146.23
C.172.34.221.18
D.10.215.34.124

A.划分为1024个子网
B.每个子网有64台主机
C.每个子网有62台主机
D.划分为2044个子网

A.172.21.136.0/21
B.172.21.136.0/20
C.172.21.136.0/22
D.172.21.128.0/21

A.DES
B.3DES
C.IDEA
D.AES

A.SSL
B.L2TP
C.IPSec
D.PPTP