2017 年 11 月卷 · 第 71 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. Sunch 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 stations on the LAN.

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