A.IEEE802.3 B.IEEE802.4 C.IEEE802.6 D.IEEE802.5
A.物理層 B.介質(zhì)訪問(wèn)控制子層 C.邏輯鏈路控制子層 D.網(wǎng)絡(luò)層
A.IEEE802.1 B.IEEE802.2 C.IEEE802.3 D.IEEE802.4