單項選擇題What is one benefit of PVST+？（）

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.


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1.多項選擇題Which two are advantages of static routing when compared to dynamic routing?（）

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.

2.多項選擇題下列算法中哪些是對稱密鑰算法（）

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

3.單項選擇題Which item represents the standard IP ACL？（）

A.access-list 50 deny 192.168.1.1 0.0.0.255
B.access-list 110 permit ip any any
C.access-list 2500 deny tcp any host 192.168.1.1 eq 22
D.access-list 101 deny tcp any host 192.168.1.1

4.多項選擇題密鑰管理需要考慮（）的基本特性

A.生成
B.驗證
C.存儲
D.撤銷和銷毀

5.單項選擇題A network administrator receives an error message while tring to configure the Ethernet interface of a router with IP address 10.24.24.24/29.which statement explains the reason for this issue?（）

A.The address is a broadcast address
B.The Ehernet interface is faulty
C.VLSM-capable routing protocols must be enable first on the router.
D.This address is a network address.