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An Intrusion Detection System (IDS) is a software or hardware tool used to detect unauthorized access of a computer system or network. A wireless IDS performs this task exclusively for the wireless network. These systems monitor traffic on user's network looking for and logging threats and alerting personnel to respond. An IDS usually performs this task in two ways, with either signature-based or anomaly based detection. Almost every IDS today is at least in part signature-based. This means that known attacks can be detected by looking for these signatures. The other approach is anomaly-based systems. These are not often implemented, mostly because of the high amount of false alarms. It detects traffic which deviates from what it considers normal an alert is generated.
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