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Merge pull request #399 from ipofss/patch-2

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fix:fix typo
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docs/network/干货：计算机网络知识总结.md
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@ -193,7 +193,7 @@
<font color="#999999">12，以太网的适配器具有过滤功能，它只接收单播帧，广播帧和多播帧。</font>
<font color="#999999">13，使用集线器可以在物理层扩展以太网（扩展后的以太网任然是一个网络）</font>
<font color="#999999">13，使用集线器可以在物理层扩展以太网（扩展后的以太网仍然是一个网络）</font>
### <font color="#003333">（3），最重要的知识点<font>
#### ① <font color="#999999">数据链路层的点对点信道和广播信道的特点，以及这两种信道所使用的协议（PPP协议以及CSMA/CD协议）的特点<font>
#### ② <font color="#999999">数据链路层的三个基本问题：**封装成帧**，**透明传输**，**差错检测**<font>