随着网络技术的不断发展,网络安全要从被动响应向主动防御转变。以前,企业不断在已有的计算机网络上添加防火墙、网络入侵检测设备、主机防病毒产品、网络身份认证系统、网络管理系统等,目的就是要加强网络的安全性,使计算机网络及其上的通用操作系统、主机应用系统受到不同程 With the continuous development of network technology, network security should change from passive response to active defense. Previously, enterprises continued to add firewalls, network intrusion detection devices, host anti-virus products, network authentication systems, and network management systems to existing computer networks in order to enhance the security of the network and make the computer network and its Common operating system, host application system by different Cheng