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[docs improve]java部分图片重新绘制
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docs/cs-basics/network/application-layer-protocol.md

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@@ -20,6 +20,8 @@ HTTP 协是基于 TCP协议,发送 HTTP 请求之前首先要建立 TCP 连接
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**简单邮件传输(发送)协议(SMTP,Simple Mail Transfer Protocol)** 基于 TCP 协议,用来发送电子邮件。
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![SMTP 协议](https://guide-blog-images.oss-cn-shenzhen.aliyuncs.com/github/javaguide/cs-basics/network/what-is-smtp.png)
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注意⚠️:**接受邮件的协议不是 SMTP 而是 POP3 协议。**
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SMTP 协议这块涉及的内容比较多,下面这两个问题比较重要:
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docs/cs-basics/network/images/network-layer/network-protocol-overview.drawio

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docs/cs-basics/network/images/osi&tcp-ip-model/application-layer.drawio

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docs/cs-basics/network/images/osi&tcp-ip-model/nerwork-layer.drawio

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docs/cs-basics/network/images/osi&tcp-ip-model/network-interface-layer.drawio

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