计算机网络第四版习题答案(中文版)(30)

计算机网络第四版习题答案(中文版)

5-6 Assuming that all routers and hosts are working properly and that all software in both is free of all errors, is there any chance, however small, that a packet will be delivered to the wrong

destination?

答：有可能。大的突发噪声可能破坏分组。使用k 位的检验和，差错仍然有2的概率被漏检。如果分组的目的地段或虚电路号码被改变，分组将会被投递到错误的目的地，并可能被接收为正确的分组。换句话说，偶然的突发噪声可能把送往一个目的地的完全合法的分组改变成送往另一个目的地的也是完全合法的分组。 k

5-7 Consider the network of Fig. 5-7, but ignore the weights on the lines. Suppose that it uses flooding as the routing algorithm. If a packet sent by A to D has a maximum hop count of 3, list

all the routes it will take. Also tell how many hops worth of bandwidth it consumes.

路径将依次为下面的路由: ABCD, ABCF, ABEF, ABEG, AGHD, AGHF, AGEB, 和 AGEF. 用到的跳数是24。

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