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OSI模型中各层次对等通信-zs
source link: http://blog.51cto.com/12484496/2084234
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物理层：Bit（比特）数据链路层：Frame(帧)网络层：Packet(包)传输层：Segment（段）会话层：SPDU 表示层：PPDU应用层：APDU总结：<1> 每一层都使用自己的协议。<2> 每一层都利用下层提供的服务与对等层通信。（在HostA与HostB之间）
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