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计算机网络与数据通信/计算机网络.md
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@ -157,6 +157,7 @@
![TCP四次挥手](https://user-gold-cdn.xitu.io/2018/5/8/1633e1676e2ac0a3?w=500&h=340&f=jpeg&s=13406)
断开一个 TCP 连接则需要“四次挥手”：
- 客户端-发送一个 FIN，用来关闭客户端到服务器的数据传送
- 服务器-收到这个 FIN，它发回一 个 ACK，确认序号为收到的序号加1 。和 SYN 一样，一个 FIN 将占用一个序号
- 服务器-关闭与客户端的连接，发送一个FIN给客户端