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分层模型介绍-王凯
source link: http://blog.51cto.com/13560258/2083543
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一：为什么要协议分层网络通信的过程很复杂，数据以电子信号的形式穿越介质到达正确的计算机，然后转换成最初的形式，以便接收者能够阅读，为了降低网络设计的复杂性，将协议进行了分层设计。二：分层设计的意义：通信服务层的模块设计可相对独立于具体的通信线路和通信硬件接口的差别
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