Definition
An intrusion prevention system (IPS) is a network security device or software application that monitors network traffic for malicious activity or policy violations. It analyzes traffic patterns and content, automatically taking action to block or prevent detected threats in real time. Implementing an IPS is crucial for proactively defending against cyberattacks, reducing the likelihood of data breaches and service disruptions. For instance, an IPS can detect and block a known exploit attempting to compromise a web server by recognizing its signature. Unlike an intrusion detection system (IDS) which only alerts administrators, an IPS actively intervenes to stop the attack. This technology is a key component tested on certifications like CompTIA Security+, CySA+, and CISSP.