随着科技的发展,计算机技术和网络技术已应用到人们生活的方方面面,新的时代背景下我们都已经离不开计算机和网络。局域网为用户的学习、生活提供了强有力的支持保障,然而许多问题也应运而生,例如网络安全。促使网络管理人员必须建立起强大的局域网安全防范体系,从各个层面保障局域网内用户及数据的安全。 With the development of science and technology, computer technology and network technology have been applied to all aspects of people’s lives. In the new era background, we can not do without the computer and network. LAN provides strong support for users’ learning and living, however, many problems emerge, such as network security. Promote network managers must establish a strong local area network security system, from all levels to protect the LAN users and data security.