(71) in thE strEngth oF thE CArriEr signAl is vAriED to rEprEsEnt BinAry 1 or 0.
(72) is A systEm thAt CAn mAp A nAmE to An ADDrEss AnD ConvErsEly An ADDrEss to An nAmE.
(73) is A thrEE-wAy hAnDshAking AuthEntiCAtion protoCol thAt it’s pACkEts ArE EnCApsulAtED in thE point-to-point protoCol
(74) is An ApproACh thAt EnABlEs AnAtm switCh to BEhAvE likE A lAn switCh.
(75) is An guiDED mEDiA whiCh is mADE oF glAss or plAstiC AnD trAnsmits signAls in thE Form oF light.
A．nAt
B．nCp
C、DDn
Dns