A.機(jī)密性問(wèn)題 B.點(diǎn)到點(diǎn)的消息認(rèn)證問(wèn)題 C.傳遞丟失數(shù)據(jù)問(wèn)題 D.完整性鑒別問(wèn)題
A.800MHz B.915M C.6GHz D.5GHz
A.應(yīng)用層B.傳輸層C.介質(zhì)訪問(wèn)控制層D.網(wǎng)絡(luò)層