Typically,an IP address refers to an individual host on a particular network.IP also accommodates addresses that refer to a grou

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问题 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  ①  group is referred to as multicasting.Multicasting done  ②  the scope of a single LAN segment is straightforward D.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  ③  multicast group recognize the multicast address and  ④ the packet.In this case,only a single copy of the packet is ever transmitted This technique works because ofthe  ⑤  nature ofa LAN:A transmission from any one station is received by all other stations on the LAN.
④处应填入?

选项 A、reject
B、accept
C、discard
D、transmit

答案  B

解析
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