Which security device passively inspects network traffic for malicious patterns and raises alerts to administrators but does not automatically block the traffic?
Stateful firewall
Network Address Translation (NAT) device
Intrusion Prevention System (IPS)
Network Intrusion Detection System (NIDS)
A Network Intrusion Detection System (NIDS) examines packets traversing the network, compares them with known attack signatures or abnormal behavior, and generates alerts when it detects suspicious activity. Because it is a detection-rather than prevention-technology, it does not alter or drop the traffic it observes. In contrast, an Intrusion Prevention System (IPS) can actively block or reject packets, a stateful firewall enforces predefined access rules, and a Network Address Translation (NAT) device simply remaps IP addresses without performing threat detection.
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