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1.1-计算机网络发展历史1
tobeavampire的博客
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计算机的osi参考模型

1.png

从独立模式(单机模式） 发展到网络互连模式

2.png

QQ截图20180706155842.png

计算机根据其规模，可分为，LAN（local area network）局域网 和 WAN(wide area network)广域网（城域网，比广域网低一个级别） 

多个局域网，通过路由器，组合成广域网。

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