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單項選擇題Which command can be a router to verify the layer 3 path to a host?（）

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

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1.單項選擇題A company has a small network,consisting of a single switch and a single router.The switch has been configured with two vlans,and route-on-a-stick is being configured on the router for inter-vlan routing.A trunk is configured to connect the switch to the router.What is the minimum number of router subinterfaces that are required for all the vlans to communicate?（）

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

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2.多項選擇題選擇加密算法時應該考慮的標準為（）

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

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3.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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4.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.

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5.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

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