计算机网络(第四版)课后习题(英文)+习题答案(中英文).pdf

ANDREW S. TANENBAUM medium-speed line, a low-speed line, or no line. If it takes 100 ms of computer time COMPUTER NETWORKS FOURTH EDITION PROBLEM SOLUTIONS to generate and inspect each topology, how long will it take to inspect all of them?(E) Collected and Modified By YanZhenXing, Mail To:zxyan@ 将路由器称为A ，B ，C，D 和E. Classify: EEasy, MMiddle, HHard DDelete 则有10 条可能的线路；AB, AC, AD, AE, BC, BD, BE, CD, CE,和DE Green: Important Red: Master Blue: VI Others:Know Grey: Unnecessary 每条线路有4 种可能性(3 速度或者不是线路) ，拓扑的总数为410 = 1,048,576 。 Chapter 1 IntroductionProblems 检查每个拓扑需要100 ms ，全部检查总共需要104,857. 6 秒，或者稍微超过29 2. An alternative to a LAN is simply a big timesharing system with terminals for 个小时。 all users. Give two advantages of a client-server system using a LAN.(M) 9. A group of 2n - 1 routers are interconnected in a centralized binary tree, with a 使用局域网模型可以容易地增加节点。 router at each tree node. Router i communicates with router j by sending a message 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 to the root of the tree. The root then sends the message back down to j. Derive an 器) 的情况下， 用局域网模型会更便宜。 approximate expression for the mean number of hops per message for large n,