intrusion detection system
a device or software application that monitors a network or systems for malicious activity
Network intrusion detection system
system that tries to detect malicious activity by monitoring network traffic
Host-based intrusion detection system
intrusion detection system
Great Firewall
censorship of the Internet in the People's Republic of China
Snort
free software intrusion prevention system
perimeter intrusion detection system
sensor that detects the presence of an intruder
Zeek
Unix based network monitoring framework