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Update 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,
**1) 无差错情况:** **1) 无差错情况:**
![](https://user-gold-cdn.xitu.io/2018/8/16/16541fa8c3816a90?w=514&h=473&f=png&s=9924) ![](https://user-gold-cdn.xitu.io/2018/8/16/16541fa8c3816a90?w=514&h=473&f=png&s=9924)
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。 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。