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本文深度剖析了互联网核心的传输控制协议 (Transmission Control Protocol, TCP)。内容系统性地阐述了 TCP 作为一种面向连接的、可靠的字节流服务的核心特性，并结合序列图，详细拆解了其生命周期中的三大关键过程：三次握手、基于序列号与确认号的可靠数据传输，以及四次挥手。
Transportlayer
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本文深度剖析了传输层核心协议之一的用户数据报协议 (User Datagram Protocol, UDP)。内容系统性地阐述了 UDP 作为一种轻量级、无连接协议的核心特性，详细拆解了其 8 字节头部的数据报结构，并解释了其“尽力而为”的不可靠传输模型。