当今许多的企业都广泛的使用信息技术,特别是网络技术的应用越来越多,而宽带接入已经成为企业内部计算机网络接入国际互联网的主要方式。而与此同时,因为计算机网络特有的开放性,企业的网络安全问题也随之而来,由于安全问题给企业造成了相当大的损失。 Nowadays, many enterprises use the information technology widely, especially the application of network technology is more and more, and broadband access has become the main way for the internal computer network to access the Internet. At the same time, because of the unique openness of the computer network, the network security problems of the enterprises also follow, resulting in considerable losses to the enterprises due to security issues.