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The purpose of intrusion detections systems (IDSs) is to monitor networks or systems with the express purpose of identifying and responding to suspicious activity. In this chapter we will learn about the concepts and basics of intrusion detection systems.

* '''Countermeasures''' - Automated countermeasures can be implemented through the deployment of Intrusion Countermeasure Equipment (ICE). Such systems will lock down a network or increase security levels in the event of an attack. Such systems should be used with care as false positives may result in unnecessary interruptions of service.

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