An administrator wanted to configure an IPS sensor to block traffic that triggers the signature set number of times during a specific time period. How can the administrator achieve the objective?
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Reference / correct answer:
Use IPS signatures, rate-mode periodical option.
Most accepted answer: D. Use IPS signatures, rate-mode periodical option.
Community votes: C=1, D=3
Selected Answer: D You configure IPS signature settings like: rate-mode = periodical Define: number of hits (count) time window (seconds) upvoted 2 times
Selected Answer: D Correct answer: D. Use IPS signatures, rate-mode periodical option. Explanation The requirement is: Block traffic when a signature is triggered a certain number of times within a specific time period This is exactly what rate-based blocking does in FortiGate IPS. You must configure it at the signature level Use: rate-mode: periodical Define: number of hits (threshold) time period When the threshold is exceeded → traffic is blocked Why the other options are incorrect A. Packet logging does not enforce blocking behavior B. “rate-mode 60” is not a valid configuration and not tied to time logic properly C. Filters are used to select signatures, not to apply rate-based behavior upvoted 2 times
Selected Answer: D Option D (Signatures): When you apply a rate-limit to a specific signature ID, the counter tracks only that one specific threat. • Option C (Filters): An IPS Filter is a dynamic bucket (e.g., "all High Severity signatures for Windows"). If you apply a rate-mode to a Filter, the rate-count becomes cumulative across every single signature inside that filter. upvoted 2 times
Selected Answer: C C. Use IPS filter, rate-mode periodical option. Under Security Profiles > Intrusion Prevention > IPS Sensor (or via CLI: config ips sensor): Create or edit an entry (filter) with criteria such as severity, protocol, CVE, signature ID, etc. Then configure the rate-based parameters: set rate-count <number> → e.g., 100 (how many times the signature must trigger) set rate-duration <seconds> → e.g., 60 (the time period) set rate-mode periodical → This is the key setting. upvoted 1 times