A.10.10.0.0~10.255.255.255 B.10.0.0.0~10.255.255.255 C.10.168.0.0~10.168.255.255 D.172.16.0.0~172.31.255.255
A.DNS B.ARP C.DHCP D.RARP
A.FF05:0000:B300 B.FF05:0:0:0:0:0:0:B300 C.FF05:0000:00B3 D.FF05:0:0:0:0:0:0:00B3
A. B. C. D.
A.物理层 B.网络层 C.传输层 D.表示层