Realize that these pictures of layered protocol boxes are not perfect.
要认识到这些描述各层协议逻辑单元的图片并不精确。
The whole model is created on the network protocol and adopts the concept layered structure.
整个模型是建立在已有网络协议的基础上，并且采用了概念分层结构。
The whole model is created on the network protocol and adopts the concept layered structure.
整个模型是建立在已有网络协议的基础上，并且采用了概念分层结构。
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