The correct answer is B. Prevent . From a performance perspective, the most resource-intensive setting is generally the one that requires the gateway not only to inspect and identify the threat, but also to enforce a blocking decision inline. Prevent mode means the protection is actively applied to traffic and the gateway must make a real-time enforcement decision. Check Point explains that Threat Prevention profiles activate protections based on factors that include the performance impact of the protection , threat severity, confidence level, and blade-specific settings. Check Point's IPS optimization guidance also warns that some protections require more system resources to inspect traffic and recommends focusing on lower-impact protections when reducing gateway resource use is necessary.
By comparison, Inactive is the least intensive because the protection is not enforced. Detect can log or report detection without blocking, which is useful for staging and troubleshooting. Inspect still consumes inspection resources, but Prevent typically represents the highest operational burden because it performs inline analysis and enforcement, and may require buffering, stream handling, packet modification, or connection termination depending on blade and protocol. In real deployments, the exact resource cost also depends on traffic mix, protocol, file size, SSL inspection, protection complexity, and whether traffic remains accelerated. Reference topics: IPS Profile Settings, protection activation, Prevent versus Detect, Performance Impact, IPS optimization.