A.網(wǎng)絡(luò)層 B.數(shù)據(jù)鏈路層和物理層 C.數(shù)據(jù)鏈路層 D.物理層
A、驗(yàn)證通信對(duì)方的身份,防止假冒 B、對(duì)傳輸數(shù)據(jù)進(jìn)行加密,防止數(shù)據(jù)被竊聽 C、防止發(fā)送者否認(rèn)發(fā)送過數(shù)據(jù) D、防止發(fā)送的報(bào)文被篡改
A./bin B./dev C./boot D./home