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tcp为啥是三次握手和四次挥手
2022-07-04 19:03:00 【大鸡腿最好吃】
三次握手,主要防止已经失效的连接请求报文突然又传送到了服务器,从而产生错误;
客户端发送ack=1,seq为x,服务器收到后发送ack=x+1,seq为y,客户端收到后发送ack为y+
1正式建立其链接
四次挥手,谁先发起都行,是双向的
客户端没有想要发送的请求后想终止链接,就发送fin=1,seq为u,服务器收到后发送ack=u=1表示自己收到了;
服务器没有想要发送的数据给客户端后,就发送fin=1,que=v,客户端收到后发送ack=v+1,链接正式结束
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