Which Intrusion Detection System is the best applicable for large environments where critical assets on the network need extra scrutiny and is ideal for observing sensitive network segments?

Honeypots are decoy systems designed to lure attackers and gain intelligence, not primarily for active intrusion detection across an entire large environment.

Firewalls are primarily used to filter network traffic based on predefined rules, acting as a preventative control, not a detection system for ongoing intrusions.

A Network-based Intrusion Detection System (NIDS) monitors network traffic at strategic points to detect suspicious activities, making it ideal for observing sensitive network segments and providing broad coverage in large environments. NIDS can identify attacks that originate from outside the network or internal anomalies by analyzing packet headers and payloads across multiple hosts.

A Host-based Intrusion Detection System (HIDS) monitors individual hosts for suspicious activities, which is less scalable and less efficient for observing entire sensitive network segments in a large environment compared to NIDS.