今天,以大型集线器所构成的局域网体系结构已出现拥挤情况,网管人员对于可扩展网络的需求也日益增长。集线器技术已无法满足对带宽、稳定性的可管理性的需求,而且集线器较昂贵的价格对用户也产生了一定的压力。在这种形势下,网络行业必须向一种新型网络体系结构—交换型网络网迈进。 Today, crowding has emerged in the LAN architecture that consists of large hubs, and network administrators have seen a growing demand for scalable networks. Hub technology has been unable to meet the bandwidth, stability, manageability needs, and hubs are more expensive prices to users also have a certain amount of pressure. In this situation, the network industry must move toward a new type of network architecture, the switched network.