What is the main function of an Intrusion Detection System (IDS)?

An Intrusion Detection System (IDS) primarily focuses on monitoring network traffic for suspicious activities and potential security breaches. Its main function is to analyze the traffic patterns, identify any abnormal behavior, and alert administrators about possible intrusions or malicious activities. By scrutinizing the data packets and communications occurring within the network, an IDS can detect unauthorized access, policy violations, or attacks on the system, thus playing a crucial role in a comprehensive security strategy.

The other options, while relevant to cybersecurity, do not represent the main function of an IDS. For instance, installing updates on network devices is part of maintaining system security but falls under patch management, not intrusion detection. Creating encryption keys pertains to secure communication but is associated with cryptography rather than intrusion detection. Regular vulnerability assessments are important for identifying security weaknesses but are a proactive measure that differs from the reactive role of an IDS in detecting ongoing threats.