Which device provides passive protection against attacks on network- and cloud-based resources?

An Intrusion Detection System (IDS) is designed to provide passive protection against attacks on network- and cloud-based resources by monitoring and analyzing traffic and system activities for signs of malicious behavior. Unlike some other security devices, an IDS does not take active measures to block or prevent attacks in real-time; instead, it passively observes network traffic and alerts administrators to potential security threats. This allows IT personnel to respond effectively to indications of unauthorized access or misuse.

In the context of network security, other devices like firewalls and routers serve more proactive roles by controlling traffic flow or managing routing based on defined security rules. Firewalls, for instance, enforce security policies by actively blocking or allowing traffic, while routers determine the optimal paths for data packets but do not specifically monitor for security threats. Thus, the IDS's focus on detection and alerting rather than direct intervention qualifies it as a device providing passive protection.