试图破解网络上某一处的安全防护措施，以便在未获得授权的情况下访问系统或者是遭到服务拒绝。

Attack An attempt to circumvent the security measures in place on a network either to gain unauthorized access to the system or to force a denial of service.

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文章介绍了进行网络安全防范所必需的安全策略、系统防护、入侵检测、应急响应体系及备份、灾难恢复策略。

This paper discusses the security strategy, system protection, intrusion detection, emergency responding system and backup, disaster restore strategy essential for network security protection.

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大量的实践证明，保障网络系统的安全，仅仅依靠传统的被动防护是不够的。

A mass of practice prove that it is not enough to ensure the security of network system only depending on traditional passive protection.

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