Intrusion detection systems monitor network and system activities for unauthorized use or attacks, using network-based, host-based, and stack-based detection. They analyze user and system behavior, configurations, vulnerabilities, and file integrity to recognize patterns of attacks and abnormal activities, and track policy violations, helping to ensure network and system security. Popular open source intrusion detection systems include Snort, OSSEC, and honeypots.
2. Intrusion detection is a security management
system for computers and networks
It is intended for sensing when a network is not
being appropriately used or is being used
without authorization
4. Monitoring and analyzing both user and
system activities
Analyzing system configurations and
vulnerabilities
Assessing system and file integrity
Ability to recognize patterns typical of attacks
Analysis of abnormal activity patterns
Tracking user policy violations
