数量不断增长的用户和数据密集型办公室、Intranet和多媒体应用程序促使带宽需求日益增加,从而给当今许多局域网的主干网带来了沉重的负担。而具有讽刺意味的是,以其可靠性、易使用性和经济性而成为大多数网络首选的以太网可能正是这一问题的来源,又是这一问题的解决办法。 出现于70年代的共享式10Mbps以太网长久以来无法吸收在网络核心快速增加的通信量。因而,到了90年代,出现了一些更快速的衍生产品,如交换式10Mbps以太网、共享式 The ever-increasing number of users and data-intensive office, intranet, and multimedia applications are driving increased bandwidth requirements, placing a heavy burden on the backbone of many LANs today. Ironically, Ethernet, which is the preferred choice for most networks because of its reliability, ease of use, and economy, may be the source of this problem and a solution to this problem. The shared 10Mbps Ethernet that appeared in the 70’s has long been unable to absorb the rapidly increasing traffic in the core of the network. Thus, by the 1990s, there have been some faster derivatives, such as switching 10Mbps Ethernet, sharing