A.FTP B.HTTP C.DNS D.ICMP
A.發(fā)送方從下層向上層傳輸數(shù)據(jù),每經(jīng)過一層附加協(xié)議控制信息 B.接收方從下層向上層傳輸數(shù)據(jù),每經(jīng)過一層附加協(xié)議控制信息 C.發(fā)送方從上層向下層傳輸數(shù)據(jù),每經(jīng)過一層附加協(xié)議控制信息 D.接收方從上層向下層傳輸數(shù)據(jù),每經(jīng)過一層附加協(xié)議控制信息
A.物理層 B.網(wǎng)絡(luò)層 C.傳輸層 D.應(yīng)用層