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TCP有几次挥手和握手？分别详述

💡 原文中文，约900字，阅读约需2分钟。

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内容提要

TCP连接建立需要三次握手，关闭需要四次挥手，以确保可靠性和顺利关闭。客户端发送SYN报文段，服务器回复ACK和SYN报文段，客户端再回复ACK报文段，完成连接建立。客户端发送FIN报文段，服务器回复ACK报文段，发送FIN报文段，客户端再回复ACK报文段，完成连接关闭。

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