Answer: A - IDS examines and recognizes different known attacks, as compared to a list of common attack signatures.
Key Takeaway: IDS, or an Intrusion Detection System, is a network security device that monitors network and system activities for malicious or unwanted behavior. Depending upon the approach and the goal of the IDS, the different types of IDS include Network based (NIDS) and Host based (HIDS) intrusion detection systems. The different types of IDS based upon how they function, are, Signature Based, Anomaly Based, and Passive IDS.
