CompTIA A+ Certification Exam 220-1001 Practice Test 8

Intrusion Detection Systems (IDSs) are devices or software applications designed to detect malicious activities or violations of security policies on a network or computer host. An IDS designed to monitor networks is known as a Network Intrusion Detection System (NIDS); an IDS monitoring a single host is called a Host Intrusion Detection System (HIDS). An IDS does not take any active steps to prevent or stop intrusions, relying on passive responses such as sending an alert to a management console or recording information about an event in logs.