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单选题
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 （71）group is referred to as multicasting. Multicasting done （72） the scope of a single LAN segment is straight forward. 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 （本题）nature of a LAN:A transmission from any one station is received by all other stations on the LAN.
A
B
C
D
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答案：
解析：
根据题干中的描述，IP地址既可以指代特定网络上的单个主机，也可以指代一个或多个网络上的主机组。这种地址被称为多播地址，而从源发送数据包到组成员的行为被称为多播。在单个局域网段范围内进行多播是直接的。因此，当数据包具有多播地址并在局域网段上传输时，属于多播组的站点会识别该多播地址并接收数据包。在这种情况下，只传输数据包的一个副本。这种技术之所以有效，是因为局域网的一个特性：来自任何站点的传输都会被局域网上的所有其他站点接收。因此，正确答案是C，即“广播”。
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