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多項(xiàng)選擇題Which characteristics are representative of a link-state routing protocol? （）

A.provides common view of entire topology
B.exchanges routing tables with neighbors
C.calculates shortest path
D.utilizes event-triggered updates
E.utilizes frequent periodic updates

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1.單項(xiàng)選擇題一個(gè)A類地址，其子網(wǎng)掩碼是255.255.240.0，有多少位被用來劃分子網(wǎng)？（）

A.8
B.12
C.20
D.24

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2.多項(xiàng)選擇題Which two commands correctly verify whether port security has been configured on port FastEthernet 0/12 on a switch?（）

A.SW1#show swithport port-security interface FastEthernet 0/12
B.SW1#show swithport port-secure interface FastEthernet 0/12
C.SW1#show port-secure interface FastEthernet 0/12
D.SW1#show running-config

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3.多項(xiàng)選擇題下面接口為物理接口的有（）。

A.dialer
B.語音接口
C.serial口
D.子接口
E.CE1/PRI接口
F.虛擬接口模板
G.ISDNBRI接口
H.備份中心邏輯通道

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4.多項(xiàng)選擇題Which of the following statements are true regarding bridges and switches?（）

A.Switches are primarily software based while bridges are hardware based.
B.Both bridges and switches forward Layer 2 broadcasts.
C.Bridges are frequently faster than switches.
D.Switches have a higher number of ports than most bridges.
E.Bridges define broadcast domains while switches define collision domains.
F.Both bridges and switches make forwarding decisions based on Layer 2 addresses.

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5.單項(xiàng)選擇題In the implementation of VLSM techniques on a network using a single Class C IP address, which subnet mask is the most efficient for point-to-point serial links（）。

A.255.255.255.0
B.255.255.255.240
C.255.255.255.248
D.255.255.255.252
E.255.255.255.254

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