IP multicasting is a set of technologies

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问题 IP multicasting is a set of technologies that enable efficient delivery of data to many locations on a network. Rather than making multiple copies of a message intended to be distributed to multiple recipients at the (请作答此选项) of origin of a message, multicasting initially sends just one ( ) and does not copy it to the individual recipients until it reaches the closest common point on the network, thereby ( ) the bandwidth consumed. Network performance is significantly ( ) because it isn’t bogged down with the processing and transmission of several large data files; each receiving computer doesn’t have to ( ) the transmitting server for the file.A.pointB.bottom        C. heaD.   D.sight

选项 A.point
B.bottom        
C. heaD.   
D.sight

答案 A

解析 IP多播是允许同时给网络上很多主机提供数据的一种技术。它并不是每次复制很多副本去发送给每一个在这个IP多播组中的接收者,而是最初只发送单一信息,并没有立即复制信息去发给每个接收者,而是直到到达网络中最近的一个共通点时才开始复制,从而最大限度地减少了对带宽的消耗。网络的性能明显得到改善,一是因为它没有立即处理和传输几个大型数据文件;二是接收端计算机不需要查询该传输服务的文件。
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