计算机网络(第四版)课后习题(英文)+习题答案(中英文)

ANDREW S. TANENBAUM

------COMPUTER NETWORKS FOURTH EDITION PROBLEM SOLUTIONS Collected and Modified By YanZhenXing, Mail To:

Classify: EàEasy, MàMiddle, HàHard,DàDelete

Green: Important Red: Master Blue: VI Others:Know Grey: Unnecessary

Chapter 1 IntroductionProblems

2. An alternative to a LAN is simply a big timesharing system with terminals for all users. Give two advantages of a client-server system using a LAN.(M)

使用局域网模型可以容易地增加节点。

如果局域网只是一条长的电缆,且不会因个别的失效而崩溃( 例如采用镜像服务

器)的情况下,使用局域网模型会更便宜。

使用局域网可提供更多的计算能力和更好交互式接口。

3. The performance of a client-server system is influenced by two network factors: the bandwidth of the network (how many bits/sec it can transport) and the latency (how many seconds it takes for the first bit to get from the client to the server). Give an example of a network that exhibits high bandwidth and high latency. Then give an example of one with low bandwidth and low latency.(E)

横贯大陆的光纤连接可以有很多千兆位/秒带宽,但是由于光速度传送要越过数千公里,时延将也高。

相反,使用 56 kbps 调制解调器呼叫在同一大楼内的计算机则有低带宽和较低的时延。

4. Besides bandwidth and latency, what other parameter is needed to give a good characterization of the quality of service offered by a network used for digitized voice traffic?(M)

声音的传输需要相应的固定时间,因此网络时隙数量是很重要的。传输时间可以用标准偏差方式表示。实际上,短延迟但是大变化性比更长的延迟和低变化性更糟。

6. A client-server system uses a satellite network, with the satellite at a height of 40,000 km. What is the best-case delay in response to a request?(E)

由于请求和应答都必须通过卫星,因此传输总路径长度为 160,000 千米。在空气和真空中的光速为 300,000 公里/秒,因此最佳的传播延迟为160,000/300,000

秒,约 533 msec。

8. A collection of five routers is to be connected in a point-to-point subnet. Between each pair of routers, the designers may put a high-speed line, a

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