A.光路衰耗 B.光纜噪聲 C.電源干擾 D.光纖色散 E.環(huán)境溫度 F.靜電
A.678 B.619 C.691 D.651
A.對(duì)網(wǎng)絡(luò)中傳輸?shù)臄?shù)據(jù)報(bào)正文加密 B.對(duì)網(wǎng)絡(luò)節(jié)點(diǎn)的數(shù)據(jù)進(jìn)行加密 C.對(duì)路由信息、校驗(yàn)和進(jìn)行加密 D.對(duì)整個(gè)網(wǎng)絡(luò)系統(tǒng)采取保護(hù)措施