Quick Answer
The answer is preventive. Rate-limiting SSH attempts by blocking IPs after five failures within ten minutes is a preventive control because it actively stops unauthorized access before it can occur, directly reducing the attack surface against brute-force attacks. On the Systems Security Certified Practitioner SSCP exam, this scenario tests your ability to distinguish between preventive and deterrent controls: preventive controls block or stop the threat, while deterrent controls discourage but do not physically prevent an action. A common trap is confusing rate-limiting with a deterrent, but remember that a firewall rule enforcing a hard block is a technical barrier, not just a warning sign. For the SSCP, think of preventive controls as “stop signs” that enforce a halt, whereas deterrents are like “speed bumps” that slow but don’t fully stop. Memory tip: “Prevent blocks, deterrence talks.”
This SSCP practice question tests your understanding of network and communications security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A security analyst reviews log files and sees multiple failed SSH attempts from various IP addresses. The analyst implements a rate-limiting rule on the firewall to block IPs after 5 failed attempts in 10 minutes. This is an example of which type of security control?
Compensating
Why wrong: Compensating controls are alternatives, not directly preventive.
Preventive
Rate-limiting blocks attacks before they succeed.
Detective
Why wrong: Detective controls monitor and alert.
Deterrent
Why wrong: Deterrent controls discourage but don't enforce.
Corrective
Why wrong: Corrective controls restore systems after an incident.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Preventive
Rate-limiting SSH attempts by blocking IPs after 5 failed attempts in 10 minutes is a preventive control because it actively stops unauthorized access before it can occur. By enforcing a threshold on the firewall, the control reduces the attack surface against brute-force attacks, directly preventing further authentication attempts from suspicious sources.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Compensating
Why it's wrong here
Compensating controls are alternatives, not directly preventive.
Preventive
Why this is correct
Rate-limiting blocks attacks before they succeed.
Related concept
Read the scenario before looking for a memorised answer.
Detective
Why it's wrong here
Detective controls monitor and alert.
Deterrent
Why it's wrong here
Deterrent controls discourage but don't enforce.
Corrective
Why it's wrong here
Corrective controls restore systems after an incident.
Common exam traps
The trap here is that candidates confuse 'preventive' with 'deterrent' because both aim to stop attacks, but preventive controls physically block the action (e.g., firewall rule) while deterrent controls only discourage it (e.g., warning banner).
Detailed technical explanation
This control leverages a stateful firewall or next-generation firewall (NGFW) with session tracking to count failed SSH attempts per source IP using a sliding window (e.g., 5 attempts within 600 seconds). The rule typically uses a dynamic blacklist or shun feature, which automatically adds the offending IP to an access control list (ACL) for a defined period, preventing further TCP SYN packets to port 22. In real-world scenarios, attackers often rotate IPs or use botnets, so rate-limiting alone may need to be combined with geo-blocking or CAPTCHA to be fully effective against distributed brute-force attacks.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
What to study next
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FAQ
Network and Communications Security — This question tests Network and Communications Security — Read the scenario before looking for a memorised answer..
The correct answer is: Preventive — Rate-limiting SSH attempts by blocking IPs after 5 failed attempts in 10 minutes is a preventive control because it actively stops unauthorized access before it can occur. By enforcing a threshold on the firewall, the control reduces the attack surface against brute-force attacks, directly preventing further authentication attempts from suspicious sources.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This SSCP practice question is part of Courseiva's free ISC2 certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SSCP exam.
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