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Software that automates the process of monitoring the events occurring in a computer system or network and analyzing them for signs of possible incidents and attempting to stop detected possible incidents.
NIST SP 800-137 under Intrusion Detection and Prevention System (IDPS)
NIST SP 800-61 Rev. 2 under Intrusion Detection and Prevention System (IDPS)
NISTIR 7621 Rev. 1 under Intrusion Detection / Prevention System from NIST SP 800-61 Rev. 2