问题详情

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. 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 of the (5)nature of a LAN: A transmission from any one station is received by all other station on the LAN.
A.numerous
B.only
C.single
[email protected]@@[email protected]@@A.within
B.out of
C.beyond
[email protected]@@[email protected]@@A.different
B.unique
C.special
[email protected]@@[email protected]@@A.reject
B.accept
C.discard
[email protected]@@[email protected]@@A.multicast
B.unicast
C.broadcast
D.multiple unicast请帮忙给出正确答案和分析，谢谢！