随着计算机技术和通信技术的发展,计算机网络已经成为人们学习、工作、娱乐和交流等方面的重要信息交换手段,渗透到社会生活的各个领域。局域网作为计算机网络最普遍的应用形式,它更是成为我们日常生活中不可或缺的一部分。由于局域网应用的多样性,使得用户上网安全面临多样威胁。本文结合生活工作中时常遇到的一些实际情况,分析局域网安全受到的一些威胁,并讨论常用的安全策略。本文提供了企业内部网络安全的几种常见的管理手段,并分别就其作用进行了阐述和探讨。 With the development of computer technology and communication technology, computer network has become an important means of information exchange in the aspects of study, work, entertainment and exchange, and has penetrated into all fields of social life. As the most common form of computer network applications, LAN is an integral part of our daily life. Due to the diversity of LAN applications, users are faced with a variety of threats to Internet security. In this paper, some practical situations often encountered in the work of life, some threats to the security of the LAN are analyzed and the commonly used security policies are discussed. This article provides several common management tools for the internal network security of enterprises, and respectively elaborates and discusses its function.