What is the main function of intrusion detection systems (IDS)?

The main function of intrusion detection systems (IDS) is to monitor network or system activities for malicious actions or policy violations. IDS are essential security tools that analyze traffic and system logs to identify suspicious behavior, potential intrusions, or breaches. By constantly monitoring for signs of attack, IDS can alert system administrators to threats, allowing them to take appropriate action to mitigate risks. This proactive approach helps maintain the integrity and security of systems and data.

The other options, while associated with IT and cybersecurity practices, do not define the primary role of an IDS. Optimizing network performance relates to tools specifically designed for managing bandwidth and traffic flow. Administering user accounts and permissions pertains to identity and access management, ensuring users have appropriate access levels. Conducting regular backups of data is focused on data recovery and continuity rather than security monitoring. Each of these functions plays a critical role in an organization's overall security posture but does not encapsulate the core function of an intrusion detection system.