Update 计算机网络 - 网络层.md

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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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CyC2018

2026-10-26 05:49:18 +08:00

parent 042c1eb97a

commit acb39dde06

12 changed files with 23 additions and 15 deletions

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notes/pics/arp-hops.png

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