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  46
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．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 stations on the LAN．
②处应填入？
选项 A、within
B、out of
C、beyond
D、cover
答案A
解析
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