第3章 网络体系结构与应用

计算机网络协议十分复杂，所以选用自顶向下逐步求精的方法，将其分为层次式结构。举例1：甲方司理要向乙方司理表达要退货的意思。举例2：甲乙两人通过邮局通讯。
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(The computer network protocol is very complex, so the method of top-down refinement is adopted, and it is divided into a hierarchical structure. Example 1: The manager of Party A wants to express to the manager of Party B that he wants to return the goods. Example 2: A and B communicate through the post office.
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