TCP三次握手四次挥手交换了几段报文

TCP三次握手四次挥手交换了3段报文。
在三次握手过程中，客户端首先发送一个请求连接的报文段（SYN），＊＊＊<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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