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Update 计算机网络.md
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计算机网络与数据通信/计算机网络.md

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@@ -193,6 +193,7 @@ TCP 提供面向连接的服务。在传送数据之前必须先建立连接,
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**1) 无差错情况:**
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![](https://user-gold-cdn.xitu.io/2018/8/16/16541fa8c3816a90?w=514&h=473&f=png&s=9924)
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发送方发送分组,接收方在规定时间内收到,并且回复确认.发送方再次发送。

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