Inmultipointnetworks,therearetreepersistencemethodswhenastationfindsachannelbusy.inthe1-persistentmethod,afterthestationfindsthelineidle,itsendsitsframeimmediately.thismethodhasthe()chanceofcollisionbecausetwoormorestationsmayfindtheline()andsendtheirframesimmediately.Inthenonpersistentmethod,astationthathasaframetosend(请作答此空)theline.Ifthelineisidle,itsendsimmediatelyIfthelineisnotidle,itwaitsa()amountoftimeandthensensesthelineagain.Thenonpersistentapproach()thechanceofcollisionbecauseitisunlikelythattwoormorestationswillwaitthesameamountoftimeandretrytosendsimultaneouslyThep-persistentapproachcombinestheadvantagesoftheothertwostrategies.Itreducesthechanceofcollisionandimprovesefficiency.
A.overhears B.hears C.listens D.senses正确答案C
