随着计算机应用的普及特别是Internet和电子商务的迅速发展,已经给企业带来了巨大的商机。这使越来越多的中小企业开始建立自己的计算机局域网。而企业局域网系统是一个非常复杂的体系,一个大型企业又有各个分厂的小型局域网组建。因此局域网组建的好坏直接影响到这个企业信息化的水平,因此建设局域网是一个挑战。 With the popularity of computer applications, especially the rapid development of the Internet and e-commerce, has brought huge business opportunities to enterprises. This has enabled more and more small and medium enterprises to start building their own computer LAN. The enterprise LAN system is a very complex system, a large enterprise has a small branch of each LAN set up. Therefore, the formation of local area network directly affect the quality of this enterprise information level, so building a local area network is a challenge.