随着Internet的发展,信息资源日益得到了广泛应用,共享与安全的矛盾亦日渐突出。需要采用防火墙技术,来屏蔽来自不被信任网络的服务请求,而允许被信任的服务请示通过。本文说明了防火墙的产生原因,阐明了防火墙的概念、功能、分类。 With the development of the Internet, information resources are increasingly being widely used, and the contradiction between sharing and security has become increasingly prominent. Firewall technology needs to be used to block service requests from untrusted networks, allowing trusted services to pass through. This article explains the causes of the firewall, clarifies the concept of firewall, function, classification.