This CS0-003 practice question tests your understanding of vulnerability management. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 is configuring a vulnerability scan for a demilitarized zone (DMZ) containing public-facing web servers. The analyst wants to minimize the risk of causing a denial-of-service condition on the servers. Which of the following scan settings should be configured?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Enable a full port scan.
Why wrong: Full port scan is more aggressive and may overload servers.
Disable safe checks to speed up the scan.
Why wrong: Safe checks help prevent disruptive tests; disabling them increases risk.
Increase the scan timeout values.
Why wrong: Longer timeouts may cause scans to wait longer, increasing resource usage.
Limit the number of concurrent checks.
This reduces the load and lowers the risk of DoS.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Limit the number of concurrent checks.
Limiting the number of concurrent checks (option D) reduces the simultaneous requests sent to the target servers, which prevents overwhelming the web server's connection pool or CPU. This is the most direct way to minimize the risk of a denial-of-service condition during a vulnerability scan, especially in a DMZ with public-facing servers that may have limited resources.
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.
Enable a full port scan.
Why it's wrong here
Full port scan is more aggressive and may overload servers.
Disable safe checks to speed up the scan.
Why it's wrong here
Safe checks help prevent disruptive tests; disabling them increases risk.
Increase the scan timeout values.
Why it's wrong here
Longer timeouts may cause scans to wait longer, increasing resource usage.
Limit the number of concurrent checks.
Why this is correct
This reduces the load and lowers the risk of DoS.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
CompTIA often tests the misconception that increasing timeout values or disabling safe checks will reduce the risk of denial-of-service, when in fact these settings either increase load or remove protections, making the scan more dangerous.
Detailed technical explanation
Vulnerability scanners like Nessus or OpenVAS use a 'safe checks' option to avoid exploiting vulnerabilities or sending malformed packets that could crash services. Limiting concurrent checks (e.g., using the 'max_hosts' or 'max_checks' settings) controls the number of parallel TCP connections, which is critical for DMZ web servers that may have a limited number of simultaneous connections (e.g., Apache's MaxClients or Nginx's worker_connections). In real-world scenarios, a misconfigured scan with high concurrency can exhaust server resources, leading to legitimate users being denied service.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
What to study next
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FAQ
Vulnerability Management — This question tests Vulnerability Management — Read the scenario before looking for a memorised answer..
The correct answer is: Limit the number of concurrent checks. — Limiting the number of concurrent checks (option D) reduces the simultaneous requests sent to the target servers, which prevents overwhelming the web server's connection pool or CPU. This is the most direct way to minimize the risk of a denial-of-service condition during a vulnerability scan, especially in a DMZ with public-facing servers that may have limited resources.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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