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重新绘制计算机网络传输层、网络层的配图 - #1468
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重新绘制计算机网络传输层、网络层的配图#1468
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重新绘制 UDP 首部、TCP 首部、三次握手、四次挥手、滑动窗口、流量控制与拥塞控制、拥塞窗口变化和快重传的配图，图中使用具体的序号、端口和窗口值；RTT 和 RTO 的公式改为代码块。
重新绘制 IP 首部、分片、分类地址、ARP、ICMP、VPN、NAT、路由器结构、分组转发和 BGP 的配图；ICMP 报文类型改为表格，补充最长前缀匹配的说明，VPN 示例的地址与新图一致。
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补充 TCP 粘包与拆包：产生原因、三种划分消息边界的方法和长度字段的实现；补充 2MSL 的含义、大量 TIME_WAIT 与 CLOSE_WAIT 的原因和处理、RFC 6298 的 RTO 参数；三次握手中对滞留连接请求的处理按 RFC 9293 改为回复 RST。
补充 TCP 粘包与拆包、TIME_WAIT 与 CLOSE_WAIT
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重新绘制传输层和网络层的 19 张配图，图中使用具体的端口、序号、地址和窗口值，SVG 源文件放在 tools/diagram/src。
文字的调整：