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@ -123,7 +123,7 @@
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## 计算机网络体系结构
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<div align="center"> <img src="pics/426df589-6f97-4622-b74d-4a81fcb1da8e.png" width="600"/> </div><br>
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<div align="center"> <img src="pics/7fa66f48-bc42-4b98-93c2-56b20feaa990.png" width="500"/> </div><br>
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### 1. 五层协议
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TCP/IP 体系结构不严格遵循 OSI 分层概念,应用层可能会直接使用 IP 层或者网络接口层。
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<div align="center"> <img src="pics/45e0e0bf-386d-4280-a341-a0b9496c7674.png" width="400"/> </div><br>
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TCP/IP 协议族是一种沙漏形状,中间小两边大,IP 协议在其中占据举足轻重的地位。
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<div align="center"> <img src="pics/d4eef1e2-5703-4ca4-82ab-8dda93d6b81f.png" width="500"/> </div><br>
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<div align="center"> <img src="pics/7048a730-a2d0-43d1-99ce-f774e4ef1b27.png" width="250"/> </div><br>
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### 4. 数据在各层之间的传递过程
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@ -165,8 +161,6 @@ TCP/IP 协议族是一种沙漏形状,中间小两边大,IP 协议在其中
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路由器只有下面三层协议,因为路由器位于网络核心中,不需要为进程或者应用程序提供服务,因此也就不需要传输层和应用层。
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<div align="center"> <img src="pics/ac106e7e-489a-4082-abd9-dabebe48394c.jpg" width="800"/> </div><br>
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# 二、物理层
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## 通信方式
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