构建安全的局域网策略

网络安全是一门涉及计算机科学、网络技术、密码技术、信息安全技术、应用数学、教论、信论等多种学科的综合性学科，它涉及的因素主要包括物理安全、系统安全、信息安全和文化安全等范围。局域网络中人为的、非人为的，有意的、无意的；非法用户入侵、计算机病毒、黑客的不断侵袭等随时威胁局域网的安全。随着计算机网络技术迅速发展，网络安全问题也日渐突出。该文分析了威胁局域网安全的主要因素，探讨了从物理环境、网络层、应用层以及管理制度方面，运用VPN、NAT、VLAN、IDS、身份验证等技术构建安全局域网的策略。

The Security Strategies of Building the LAN

Network security is one involving computer science, network technology, cryptography, information security technology, applied mathematics, number theory, information theory, such as the integrated multi-disciplinary subject, it involves the major fctors, including physical security, systems security, information secunity and the scope of cultural security. Local Area Network in man-made, not artificial, intentional, unintentional; invasion of illegal users, computer viruses, hacker attacks, such as the constant threat of LAN security at any time.With the fast development of computer network technology,the problems of network security have been more and more important.In this paper,it analyzes the primary ingredient which threaten the LAN, discusses from the physical circumstance,the network-layer, the application-layer and the manageing system,uses VPN,NAT,VLAN,IDS,authentication and so on to build the LAN security strategy.