A.IKE
B.安全套階層
C.SSH
D.PGP

A.10
B.40
C.30
D.20

A.remote DLCI on the main interface
B.local DLCI on the main interface
C.local DLCI on the subinterface
D.remote DLCI on the subinterface

A.加密—加密—解密
B.加密—解密—加密
C.解密—加密—解密
D.加密—加密—加密

A.traceroute address
B.tracert address
C.ssh address
D.telnet address

A.one
B.three
C.two
D.zero

A.算法是受到密碼界社團(tuán)信任的
B.算法能夠充分抵抗強(qiáng)力攻擊
C.算法支持可變的和長的密鑰長度以及擴(kuò)展性
D.算法有沒有出口和進(jìn)口限制

A.PVST+reduces the CPU cycles for all the switches in the network
B.PVST+automatically selects the root bridge location，to provide optimiz…
C.PVST+allow the root switch location to be optimized per vlan.
D.PVST+supports Layer 3 load balancing without loops.

A.Security increases because only the network administrator may change the routing tables.
B.Configuration complexity decreases as network size increases.
C.Routing updates are automatically sent to neighbors.
D.Route summarization iscompued automatically by the router.
E.Routing traffic load is reduced when used in stub network links
F.An efficient algorithm is used to build routing tables,using automatic updates.
G. Routing tables adapt automatically to topology changes.

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