In the context of network security, what is the primary function of an IDS?

The primary function of an Intrusion Detection System (IDS) is to monitor network traffic for suspicious activity. An IDS analyzes the data traffic and looks for patterns that may indicate unauthorized access or malicious behavior within the network. By constantly scanning and evaluating the various data packets flowing through the network, the IDS can detect potential threats and alert network administrators, allowing for timely response and mitigation of security risks.

While other options such as preventing unauthorized access, providing firewall protection, and encrypting sensitive data are crucial components of overall network security, they represent different aspects of security systems. An IDS does not actively block or prevent attacks; instead, it serves as an early warning system that helps organizations understand and respond to potential threats effectively, thereby enhancing their security posture.