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

An Intrusion Detection System (IDS) primarily serves to monitor network traffic for suspicious activities. This involves analyzing traffic patterns and behaviors to identify potential security threats, such as unauthorized access attempts, malware activity, or other forms of cyberattacks. The IDS can generate alerts for administrators when it detects anomalies or unauthorized actions, allowing for prompt investigation and response.

This function is crucial for maintaining the integrity and security of information systems, as it helps organizations quickly identify and react to potential security incidents. By continuously monitoring network traffic, an IDS contributes to proactive defense strategies in cybersecurity.

The other options do focus on important aspects of cybersecurity but do not align with the main function of an IDS. For example, encrypting network traffic is primarily a function of encryption technologies that ensure confidentiality, while controlling access to network resources involves mechanisms like firewalls and authentication systems. Backing up important data relates to data preservation practices rather than real-time monitoring of security incidents.