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TCP IP

一、3次握手

1、客户端向服务端发起建连请求

![image-20181120182212009](/Users/wangqingyong/Library/Application Support/typora-user-images/image-20181120182212009.png)

2、服务端响应

![image-20181120182639617](/Users/wangqingyong/Library/Application Support/typora-user-images/image-20181120182639617.png)

3、客户端确认

![image-20181120182920112](/Users/wangqingyong/Library/Application Support/typora-user-images/image-20181120182920112.png)

二、4次断开