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多項(xiàng)選擇題下面接口為物理接口的有（）。

A.dialer
B.語(yǔ)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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1.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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2.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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3.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

4.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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5.單項(xiàng)選擇題While troubleshooting a connectivity problem, a network administrator notices that a port status LED on a Cisco Catalyst series switch is alternating green and amber. Which condition could this indicate（）。

A.The port is experiencing errors
B.The port is administratively disabled
C.The port is blocked by spanning tree
D.The port has an active link with normal traffic activity

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