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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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1.多項(xiàng)選擇題下列哪些接口可作邏輯通道？（）

A.X.25
B.幀中繼
C.dialer
D.同/異步串口

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2.多項(xiàng)選擇題What are some of the advantages of using a router to segment the network?（）

A.Filtering can occur based on Layer 3 information.
B.Broadcasts are eliminated.
C.Routers generally cost less than switches.
D.Broadcasts are not forwarded across the router.
E.Adding a router to the network decreases latency.

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3.單項(xiàng)選擇題OSI中，哪些不是表示層功能？（）

A.數(shù)據(jù)加密
B.數(shù)據(jù)壓縮
C.密碼控制
D.數(shù)據(jù)格式轉(zhuǎn)換

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4.判斷題CSMA/CD網(wǎng)絡(luò)中，所有主機(jī)都可獨(dú)占網(wǎng)絡(luò)帶寬。

參考答案：錯(cuò)

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

A.Bridges are faster than switches because they have fewer ports.
B.A switch is a multiport bridge.
C.Bridges and switches learn MAC addresses by examining the source MAC address of each frame received.
D.A bridge will forward a broadcast but a switch will not.
E.Bridges and switches increase the size of a collision domain.

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