判斷題幀中繼網(wǎng)是因特網(wǎng)的一種。

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4.單項(xiàng)選擇題當(dāng)一臺(tái)計(jì)算機(jī)從FTP服務(wù)器下載文件時(shí),在該FTP服務(wù)器上對(duì)數(shù)據(jù)進(jìn)行封裝的五個(gè)轉(zhuǎn)換步驟是()

A.比特,數(shù)據(jù)幀,數(shù)據(jù)包,數(shù)據(jù)段,數(shù)據(jù)
B.數(shù)據(jù),數(shù)據(jù)段,數(shù)據(jù)包,數(shù)據(jù)幀,比特
C.數(shù)據(jù)包,數(shù)據(jù)段,數(shù)據(jù),比特,數(shù)據(jù)幀
D.數(shù)據(jù)段,數(shù)據(jù)包,數(shù)據(jù)幀,比特,數(shù)據(jù)

5.單項(xiàng)選擇題通信系統(tǒng)必須具備的三個(gè)基本要素是()

A.終端.電纜.計(jì)算機(jī)
B.信號(hào)發(fā)生器.通信線路.信號(hào)接收設(shè)備
C.信源.通信媒體.信宿
D.終端.通信設(shè)施.接收設(shè)備