An Intrusion Detection System (IDS) primarily functions by monitoring network traffic and system activities to detect suspicious behavior or potential security breaches. Its main role is to analyze data packets traveling through the network or events occurring on a system, looking for patterns or signatures that may indicate unauthorized access or malicious activity.
When it detects such suspicious activities, the IDS generates alerts to inform administrators or security personnel about potential threats, allowing them to take appropriate actions to mitigate risks. Unlike prevention systems, an IDS does not actively block traffic or alter the flow of data; instead, it focuses on surveillance and reporting. This aspect is crucial for maintaining the security posture of an organization as it enables timely responses to emerging threats.
The correct answer highlights the detection and alerting capabilities of an IDS, which are essential components for safeguarding information systems.