In the implementation of VLSM techniqu...

单项选择题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.判断题OSI中，链路层和传输层都是面向连接的，但链路层建立的是点到点的连接，传输层建立的是端到端的连接。

参考答案：对

2.单项选择题IP地址与它的掩码取反相与，所得的非零点分十进制数是此IP地址的（）。

A.A类
B.主机地址
C.网络地址
D.解析地址

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3.单项选择题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.多项选择题下列哪些接口可作逻辑通道？（）

A.X.25
B.帧中继
C.dialer
D.同/异步串口

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5.多项选择题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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6.单项选择题OSI中，哪些不是表示层功能？（）

A.数据加密
B.数据压缩
C.密码控制
D.数据格式转换

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7.判断题CSMA/CD网络中，所有主机都可独占网络带宽。

参考答案：错

8.多项选择题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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9.单项选择题What is the maximum data rate specified for IEEE 802.11b WLANs（）。

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

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10.判断题IEEE802.3不是VLAN的标准。

参考答案：对