An organization wants a solution that passively inspects all network packets for signs of intrusion and only issues alerts, leaving traffic flow unchanged. Which control satisfies this requirement?
VPN concentrator
Network Intrusion Detection System (NIDS)
Network firewall
Intrusion Prevention System (IPS)
A Network Intrusion Detection System (NIDS) is designed to monitor network traffic, analyze it for suspicious patterns, and alert administrators when potential attacks are detected. It operates out-of-band, so it does not sit inline with traffic and therefore cannot block or drop packets. A firewall filters traffic based on predefined rules but is not primarily a detection tool. An Intrusion Prevention System (IPS) also analyzes traffic but sits inline and can actively block or terminate malicious connections, which goes beyond simply alerting. A VPN concentrator provides secure, encrypted tunnels for remote users and does not perform threat detection. Therefore, the NIDS best meets the requirement for passive monitoring and alerting.
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