网络安全的问题已经日益突出,越来越引起世界各国的严密关注。随着计算机网络技术的突飞猛进,计算机网络在人类生活各个领域的广泛应用,不断出现网络被非法入侵,重要资料被窃取,网络系统瘫痪等严重问题,网络、应用程序的安全漏洞越来越多;各种病毒泛滥成灾。因此,必须要加强安全意识,并及早防范。目前最常用的网络安防范工具是防火墙。 The issue of cybersecurity has become increasingly prominent, attracting more and more attention from all countries in the world. With the rapid development of computer network technology, the widespread application of computer network in all fields of human life has brought about serious problems such as illegal network intrusion, theft of important data and the collapse of network system. More and more network and application security vulnerabilities exist. A variety of viruses flooded. Therefore, we must strengthen safety awareness and prevent it as soon as possible. At present, the most commonly used network security tool is a firewall.