国际著名的网络安全研究公司Hurwitz Group提出了五个层次的网络系统安全体系:(1)网络安全性:通过判断IP源地址,拒绝末经授权的数据进入网络。(2)系统安全性:防止病毒对于网络的威胁和黑客对于网络的破坏和侵入。(3)用户安全性:针对安全性问题而进行的用户分组管理。首先是根据不同的安全级别将 Hurwitz Group, a famous international network security research company, put forward five levels of network system security system: (1) Network Security: By judging the IP source address, denying unauthorized data to enter the network. (2) system security: to prevent the threat of viruses on the network and hackers for network destruction and invasion. (3) user security: user group management for security issues. The first is based on different levels of security will be