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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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1.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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2.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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3.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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4.判斷題OSI中，鏈路層和傳輸層都是面向連接的，但鏈路層建立的是點(diǎn)到點(diǎn)的連接，傳輸層建立的是端到端的連接。

參考答案：正確

5.單項(xiàng)選擇題IP地址與它的掩碼取反相與，所得的非零點(diǎn)分十進(jìn)制數(shù)是此IP地址的（）。

A.A類
B.主機(jī)地址
C.網(wǎng)絡(luò)地址
D.解析地址

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