What is the main purpose of implementing an Intrusion Detection System?

The main purpose of implementing an Intrusion Detection System (IDS) is to detect unauthorized access to a network or system. An IDS is designed to monitor and analyze network traffic for signs of suspicious activity or policy violations. When it identifies any unusual behavior, such as attempts to breach security or access restricted areas without permission, it alerts system administrators or security personnel. This capability is crucial for maintaining the integrity, confidentiality, and availability of sensitive information, ensuring quick responses to potential security incidents before they can cause harm.

Other options, while relevant in different contexts, do not align with the primary function of an Intrusion Detection System. For instance, preventing natural disasters goes beyond the scope of an IDS, as it is focused on security-related threats rather than environmental concerns. Monitoring employee performance or enhancing productivity are management and operational functions that do not pertain to security and are not the focus of an IDS. Therefore, the correct choice emphasizes the core aim of IDS to safeguard systems from unauthorized interventions.