21世纪是信息时代,随着网络技术的突飞猛进,计算机局域网越来越向大型化、专业化、复杂化方向发展。一方面,人们对计算机局域网的依赖性也越来越强,从而对网络的稳定性和可靠性提出了越来越高的要求。另一方面,由于局域网的广泛应用,其用户大都为不太了解网络技术的人,让他们设 The 21st century is the information age. With the rapid development of network technology, the development of large-scale, specialized and complicated computer local area networks has become more and more. On the one hand, people are more and more dependent on the computer LAN, and thus put forward higher and higher requirements on the stability and reliability of the network. On the other hand, due to the widespread use of local area network, most of its users are people who do not know much about network technology and have them set up