0引言信息技术在我国不断发展,许多企业、政府机构、高等院校先后引入互联网络技术,成立自己的信息网络平台,而局域网作为信息网络平台的核心,其安全问题备受关注。近年来,病毒、黑客袭击、网络数据泄密以及网络设备破坏等问题时常发生,局域网的安全受到严重影响。网络安全隐患的增加给企事业单位的正常运转带来了难以估量的影响。在这一背景下,针对企事业单位局域网安全维护的研究势必成为备受瞩目的焦点。企事业单位局域网安全体系的构建,涉及 0 Introduction The continuous development of information technology in our country, many enterprises, government agencies, universities have introduced the Internet technology, set up their own information network platform, and LAN as the core of the information network platform, its security concerns. In recent years, viruses, hacker attacks, network data leakage and network equipment damage and other issues often occur, the LAN security has been seriously affected. Increased network security risks to the normal operation of enterprises and institutions has brought an incalculable impact. Under this background, the research on LAN security maintenance for enterprises and institutions is bound to become the focus of much attention. Enterprises LAN security system construction, involving