随着国际互联网络的快速普及和发展,计算机网络在人们的生活、工作中发挥着越来越大的作用。如同现实社会的缩影,Internet世界也充满着正义与邪恶。本文较详细的介绍了网络安全的概念和特点、系统安全评估、黑客攻击手段以及网络安全工具,同时,针对电信IP网的公众化特点,提出了多层次、全方位的防范体系。 With the rapid popularization and development of the Internet, computer networks play an increasingly important role in people’s life and work. As a microcosm of the real world, the Internet world is full of justice and evil. This article introduces the concept and characteristics of network security in detail, system security assessment, hacker attack tools and network security tools. At the same time, aiming at the public characteristics of telecom IP network, a multi-level and omni-directional prevention system is proposed.