求翻译：随着网络技术的普及及运用，网络安全问题日渐突出，黑客入侵攻击进行网络攻击已经成为影响网络安全的主要因素，该文就如何有效地防止网络攻击、增强网络安全防范能力，从网络安全的层次体系、网络安全的威胁及网络攻防技术进行了简要叙述，重点对网络攻击前奏从网络踩点、网络扫描、网络监听等方面常用的技术和使用的工具进行了比较详细的分析讨论，并指出了针对网络攻击的前奏用应采取的对策。是什么意思？

With the popularity and use of network technology, network security issues become increasingly prominent, hacking attacks cyber attacks has become a major factor affecting network security, the article on how to effectively prevent network attacks, enhance network security capabilities, from network

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Along with the networking popularization and the utilization, the network security question highlights day after day, the hacker invaded the attack to carry on the network attack already to become the influence network security the primary factor, how did this article on prevent effectively the netw

As network technology of universal and the using, network security problem increasingly highlight, hacker intrusion attack for network attack has became effect network security of main factors, the text on how effective to prevent network attack, and enhanced network security prevention ability, fro

With popularization and application of the network technique, the online security question is outstanding day by day, the hacker invades and attacks and carries on the cyber attack to become the main factor which influences the online security, on what a safe precaution ability of the network of pre