ISO的OSI 7层模型，TCP/IP协议

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aircraftdeMacBook-Pro:etc ldl$ arp -a
? (172.16.111.255) at (incomplete) on vmnet1 ifscope [ethernet]
? (192.168.1.1) at d4:5f:25:e5:f0:bd on en0 ifscope [ethernet]
? (192.168.1.8) at (incomplete) on en0 ifscope [ethernet]
? (192.168.1.255) at (incomplete) on en0 ifscope [ethernet]
? (192.168.220.255) at (incomplete) on vmnet8 ifscope [ethernet]
? (224.0.0.251) at 1:0:5e:0:0:fb on en0 ifscope permanent [ethernet]
? (239.255.255.250) at 1:0:5e:7f:ff:fa on en0 ifscope permanent [ethernet]

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SNMP:简单网络管理协议，是用作服务器监控的。

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IP包头：

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