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

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

admin2019-02-25  35
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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