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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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制數(shù)是此IP地址的()。

A.A類
B.主機地址
C.網(wǎng)絡地址
D.解析地址

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

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

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.

6.單項選擇題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

8.多項選擇題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.

9.單項選擇題What is the maximum data rate specified for IEEE 802.11b WLANs()。

A.10Mbps
B.11Mbps
C.54Mbps
D.100Mbps

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