中山大学软件学院2009级软件工程专业2011学年秋季学期S E301计算机网络期末试题参考答案A1.12points.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 digital64kbps bit stream encode on the fly.Host A then groups the bits into56byte packets.There is one link between Host A and B its transmission rate is500kbps and its propagation delay is2msec.As soon as Host A gathers a