Secondly, on the basis of introduction to the normal intrusion methods and state of art of network IDS, contemporary challenges and trends are discussed about IDS.

其次，在介绍常用入侵手段和网络入侵检测系统研究现状的基础上，讨论了当前入侵检测技术面临的挑战和发展趋势展望。

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Skyhook maps the locations of wireless networks by driving around with a Wi-Fi antenna and software that automatically records network IDs and signal strength (a practice known as war-driving).

Skyhook在地图上标出无线网络的位置，是通过驱动附带的Wi - Fi天线和软件，软件可以自动记录网络ID和信号强度约（如网路应用驱动的做法）。

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For example, the database requires that network IDs not exceed eight characters in length, but we'll also enforce our business rule that a network ID must be no fewer than six characters in length.

如，数据库要求网络ID长度不超过8个字符，但是，我们也会加强我们的业务规则，要求网络ID的长度必须不小于6位字符。

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Because the original deployments of IDS were just passive data collectors there was no impact on network performance from adding new signatures so the data base grew and grew and the logs IDS generated grew and grew to the point where even a mid-size organization would receive millions of alerts a day.

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