Inlow-speednetwork,itisusuallyadequatetowaitforcongestiontooccurandthenreacttoitbytellingthesourceofpacketstoslowdown.Inhigh-speednetworks,thisapproachoftenworkspoorly,becauseinthe(本题)betweensendingthenotificationandnotificationarrivingatthesource,thousandsofadditional(72)mayarrive.InATMnetwork,amajortoolforpreventing(73)is(74)control.Whenahostwantsanewvirtual(75),itmustdescribethetraffictobeofferedandtheserviceexpected.
A.interval B.time C.slot D.delay正确答案A
