Intrusion Detection Systems Information Intrusion Detection Systems ( IDS ) have many approaches. This page is intended to document the different approaches and reference places where more information can be obtained. Intrusion Detection Systems — http://en.wikipedia.org/wiki/Intrusion_detection_system Intrusion Prevention Systems — http://en.wikipedia.org/wiki/Intrusion-prevention_system Host-based IDS — http://en.wikipedia.org/wiki/Host-based_intrusion_detection_system Application Protocol-based IDS — http://en.wikipedia.org/wiki/Application_Protocol-based_Intrusion_Detection_System Network IDS — http://en.wikipedia.org/wiki/Nids