OneofthemostwidelyusedroutingprotocolsinIPnetworksistheRoutingInformationProtocol(RIP)。RIPisthecanonicalexampleofaroutingprotocolbuiltonthe(请作答此空)algorithm.Routingprotocolsininternetworksdifferslightlyfromtheidealizedgraphmodel.Inaninternetwork,thegoaloftherouterstoforwardpacketstovarious(). RoutersrunningRIPsendtheiradvertisementaboutcostevery()seconds.Arouteralsosendsanupdatemessagewheneveranupdatefromanotherroutercausesittochangeitsroutingtable. Itispossibletousearangeofdifferentmetricsorcostsforthelinksinaroutingprotocol.RIPtakesthesimplestapproach,withalllinkcostsbeingequal()Thusitalwaystriestofindtheminimumhoproute.Validdistancesare1through()ThisalsolimitsRIPtorunningonfairlysmallnetworks.
A.distance vector B.link state C.flooding D.minimum spanning tree正确答案A
