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（ ）group is referred to as multicasting. Multicasting done（ ）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 （ ）multicast group recognize the multicast address and （ ）the packet.In this case，only a single copy of the packet is ever transmitted.This technique works because of the （ ）nature of a LAN：A transmission from any one station is received by all other stations on the LAN.
问题1选项
答案： D、A、D、B、C
略。
