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單項選擇題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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1.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到點的連接，傳輸層建立的是端到端的連接。

參考答案：正確

2.單項選擇題IP地址與它的掩碼取反相與，所得的非零點分十進(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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3.單項選擇題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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4.多項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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5.多項選擇題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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