【摘要】 <正> 1 引言组播(multicast)是种一点对多点的传输方式,随着网络技术的发展,将应用于视频会议、视频点播、远程教育等各个方面。IP协议专门预留了组播地址。IPv4协议对组播预留了D类地址,一个IP组播组由一个D类地址标识,D类地址的高四位为“1110”,后跟28位组播组标识;IPv6协议也为组播预留了地址空间,地址高8位为“11111111”,后跟120位组播组标识。更多还原

【Abstract】 This paper presents a weighted cost-benefit approach based on multicast. Grounded on overlay network model, its principal idea is to construct cost function and benefit function. When estimated benefit is more than cost, multicast request is accepted. This paper demonstrates its application in packet-switched networks and points out its merits and shortcomings.更多还原