计算机网络 自顶向下方法 影印版 第四版 期末试卷及答案 (James)

期末试卷配套教材：

书名：计算机网络 自顶向下方法 影印版 第四版
作者：James.F.Kurose Keith.W.Ross
出版社：高等教育出版社

期末试卷概述：

1. (12 points.) In this problem we consider sending real-time voice from Host A to Host B over packet-switched network (VoIP). Host A converts analog voice to a digital 64 kbps bit stream (encode) on the fly. Host A then groups the bits into 56-byte packets. There is one link between Host A and B; its transmission rate is 500 kbps and its propagation delay is 2 msec. As soon as Host A gathers a packet, it sends it to Host B. As soon as Host B receives an entire packet, it converts the packet’s bits to an analog signal (decode). How much time elapses from the time a bit is created (from the original analog signal at Host A) until the bit is decoded (as part of the analog signal at Host B)?