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计算机局域网是将小区域内的各种计算机及通讯设备互连在一起的网络,特别适合于企事业单位和学校的信息管理、工业控制、办公自动化及网上教学,并得到了迅速的推广和应用。但是,无论是在局域网还是在广域网中,都存在着自然和人为等诸多因素的脆弱性和潜在威胁。故此,网络的安全措施应是能全方位地针对各种不同的威胁和脆弱性,这样才能确保网络信息的保密性、完整性和可用性
Computer LAN is a network that interconnects various computers and communication devices in a small area. It is especially suitable for information management, industrial control, office automation and online teaching in enterprises, institutions and schools and has been rapidly popularized and applied. However, there are many factors, such as natural and human-induced vulnerabilities and potential threats, both in the LAN and in the WAN. Therefore, the network security measures should be able to comprehensively address a variety of different threats and vulnerabilities, so as to ensure the confidentiality, integrity and availability of network information