AnytimeahostorarouterhasanIPdatagramtosendtoanotherhostorrouter,ithasthe()addressofthereceiver.ThisaddressisobtainedfromtheDNSifthesenderisthehostoritisfoundinaroutingtableifthesenderisarouter.ButtheIPdatagrammustbe()inaframetobeabletopassthroughthephysicalnetwork.Thismeansthatthesenderneedsthe(请作答此空)addressofthereceiver.ThehostortheroutersendsanARPquerypacket.ThepacketincludesthephysicalandIPaddressesofthesenderandtheIPaddressofthereceiver.Becausethesenderdoesnotknowthephysicaladdressofthereceiver,thequeryis()overthenetwork.EveryhostorrouteronthenetworkreceivesandprocessestheARPquerypacket,butonlytheintendedrecipientrecognizesitsIPaddressandsendsbackanARPresponsepacket.Theresponsepacketcontainstherecipient'sIPandphysicaladdresses.Thepacketis()directlytotheinquirerbyusingthephysicaladdressreceivedinthequerypacket.
A.local B.network C.physical D.logical正确答案C
