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> 七层模型的划分如下:
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- ![ ISO的OSI七层网络模型] ( )
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+ ![ ISO的OSI七层网络模型] ( https://i.loli.net/2019/01/10/5c3753e50b452.png )
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#### 7、应用层
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> OSI七层网络模型 过于繁杂,而应用更为广泛的网络模型是 TCP/IP四层的参考模型,它们都很相似。
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- ![ TCP/IP四层参考模型] ( )
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+ ![ TCP/IP四层参考模型] ( https://i.loli.net/2019/01/10/5c37573d0cc07.png )
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#### 4、应用层
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<h3 style =" padding-bottom :6px ; padding-left :20px ; color :#ffffff ; background-color :#E74C3C ;" >三、五层网络模型</h3 >
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- > 还有少数资料将网络协议划分为五层:应用层、传输层、网络层、数据链路层、物理层。
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+ > 还有少数资料将网络协议划分为五层:应用层、传输层、网络层、数据链路层、物理层。
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+ ![ 五层因特网协议栈] ( https://i.loli.net/2019/01/10/5c375848ea8f7.png )
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<h3 style =" padding-bottom :6px ; padding-left :20px ; color :#ffffff ; background-color :#E74C3C ;" >一、3次握手过程</h3 >
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- ![ 三次握手 ] ( )
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+ ![ TCP三次握手 ] ( https://i.loli.net/2019/01/10/5c3768734d0d2.png )
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#### 第一次握手
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<h3 style =" padding-bottom :6px ; padding-left :20px ; color :#ffffff ; background-color :#E74C3C ;" >二、4次挥手过程</h3 >
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- ![ 三次挥手 ] ( )
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+ ![ TCP四次挥手 ] ( https://i.loli.net/2019/01/10/5c376853c0109.png )
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#### 第一次挥手
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