How do intrusion detection systems (IDS) and intrusion prevention systems (IPS) differ?

Intrusion Detection Systems (IDS) and Intrusion Prevention Systems (IPS) serve different functions in network security, and the choice indicating that IDS monitors and alerts on potential threats accurately captures the role of an IDS.

IDS is designed to observe network traffic and identify any suspicious activity that could indicate a security threat or breach. When an IDS detects potentially malicious behavior, it generates alerts that inform network administrators, allowing them to take necessary actions to mitigate the risk. However, it does not take active measures to block or prevent these threats from occurring.

Understanding the specifics of how each system operates is critical. An IPS, in contrast, is intended not only to detect threats but also to take proactive steps to prevent them from entering the network, making it an active security layer. This fundamental difference distinguishes the functions of IDS and IPS in security infrastructures.

By highlighting the monitoring and alerting capabilities of IDS, the chosen answer conveys its primary function effectively.