What is the main function of an Intrusion Prevention System (IPS)?

An Intrusion Prevention System (IPS) primarily functions to actively monitor network and system activities for malicious behavior and to take action against potential threats in real time. When it detects an intrusion or attack, the IPS not only identifies the anomaly but also responds by blocking it before it can exploit a vulnerability or cause damage. Additionally, the system generates alerts to inform administrators about the attempted intrusion, allowing for further investigation and response.

The significance of this proactive approach is that it enhances overall network security by preventing harm rather than merely documenting and alerting after an attack has occurred. While other options might address different aspects of network security, they do not encapsulate the dual role of detecting and actively preventing intrusions as effectively as the selected answer. Thus, the role of an IPS as a barrier against threats while notifying administrators makes this understanding of its function essential in the realm of network security.