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Original file line number	Diff line number	Diff line change
`@@ -157,6 +157,7 @@`
`157`	`157`	`![TCP四次挥手](https://user-gold-cdn.xitu.io/2018/5/8/1633e1676e2ac0a3?w=500&h=340&f=jpeg&s=13406)`
`158`	`158`
`159`	`159`	`断开一个 TCP 连接则需要"四次挥手":`
	`160`	`+`
`160`	`161`	`- 客户端-发送一个 FIN,用来关闭客户端到服务器的数据传送`
`161`	`162`	`- 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`
`162`	`163`	`- 服务器-关闭与客户端的连接,发送一个FIN给客户端`

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