What does an intrusion detection system do? How does it do it?

This question assesses your technical knowledge and understanding of cybersecurity concepts, specifically around intrusion detection systems (IDS). Employers want to ensure you have a solid grasp of how these systems work and their importance in protecting network infrastructure. Your ability to articulate the functioning and purpose of IDS indicates your level of expertise in the field and whether you fit the technical requirements of the role.

Begin by defining what an intrusion detection system is, such as, "An intrusion detection system is a security tool designed to monitor network or system activities for malicious activities or policy violations." Follow up with how it operates, explained through two types of IDS: signature-based and anomaly-based. For example, you might say, "Signature-based IDS detects known threats using a database of signatures, while anomaly-based IDS establishes a baseline of normal activities and alerts on deviations from that baseline." This demonstrates your technical knowledge and understanding of the roles played by different types of intrusion detection systems.