单项选择题
A.802.2B.802.3C.802.4D.802.5
A.172.31.21.12/16B.172.31.89.100/12C.12.49.127.88/8D.12.156.109.252/20
A.TCPB.IPC.ARPD.DHCP
A.192.156.90.100B.172.19.243.254C.11.200.99.180D.221.24.250.207
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