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　　● Typically, an IP address refers to an individual host on a particular network. IP also accommodates addresses that refer to a group of hosts on one or more networks. Such addresses are referred to as multicast addresses, and the act of sending a packet from a source to the members of a (71)group is referred to as multicasting. Multicasting done (72)the scope of a single LAN segment is straightforward. IEEE 802 and other LAN protocols include provision for MAC-level multicast addresses. A packet with a multicast address is transmitted on a LAN Segment. Those stations that are members of the (73)multicast group recognize the multicast address and (74)the packet. In this case, only a single copy of the packet is ever transmitted. This technique works because of the (75)nature of a LAN: A transmission from any one station is received by all other station on the LAN.

　　(69)A.numerous

　　B.only

　　C.single

　　D.multicast

　　(70)A.within

　　B.out of

　　C.beyond

　　D.cover

　　(71)A.different

　　B.unique

　　C.special

　　D.corresponding