文章通过对计算机网络入侵方法与手段的分析，提出一些防范措施和侦查取证方法。

Through the analysis of network intrusion methods, this article advances some prevention measures, investigation methods and methods of obtaining evidences.

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计算机取证技术是当今一种热门的动态安全技术，它采用主动出击的方法，搜集入侵证据，查出黑客的来源，有效地防范黑客入侵。

Computer forensic is a dynamic security technology. It collects the proofs of intrusion and finds the source of hacker with the active methods, so it can prevent hacker intrusion effectively.

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在遭受入侵时它能实时地收集可靠的证据，完成入侵事件的检测和取证分析，弥补了入侵检测的不足，有效地阻止了黑客攻击。

It can collect the proofs timely and accomplish the analysis of detection and forensic when intruded. This system makes up the lack of intrusion detection, and prevents hacker attacks effectively.

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