A.應(yīng)用層B.網(wǎng)絡(luò)層C.傳輸層D.物理層
A.255.255.255.255 B.255.255.255.0 C.255.255.0.0 D.255.0.0.0
A.173.0.0.0 B.173.18.0.0 C.173.18.8.0 D.173.18.8.1