Typically，anIPaddressreferstoanindividualhostonaparticularnetwork.IPalsoaccommodatesaddressesthatrefertoagroupofhostsononeormorenetworks.Sunchaddressesarereferredtoasmulticastaddresses，andtheactofsendingapacketfromasourcetothemembersofa(71)groupisreferredtoasmulticasting.Multicastingdone(72)thescopeofasingleLANsegmentisstraightforward.IEEE802andotherLANprotocolsincludeprovisionforMAC-levelmulticastaddresses.ApacketwithamulticastaddressistransmittedonaLANsegment.Thosestationsthataremembersofthe(73)multicastgrouprecognizethemulticastaddressand(本题)thepacket.Inthiscase,onlyasinglecopyofthepacketisevertransmitted.Thistechniqueworksbecauseofthe(75)natureofaLAN:AtransmissionfromanyonestationisreceivedbyallotherstationsontheLAN.
A.reject
B.accept
C.discard
D.transmit
正确答案是B