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Practice CS0-003 exam questions across 4 domains. Detailed answer explanations. Start with 10 free questions — no signup required.
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CompTIA CySA+ (CS0-003) is a CompTIA certification with approximately 85 questions in 165 minutes. The table below shows the exam weighting published for each domain, so you can decide where to spend your study time instead of working through the syllabus in order.
| Domain | Exam weight | What it covers |
|---|---|---|
| Security Operations | 33% | Monitor, analyze, and respond to security events using SIEM, EDR, and threat intelligence |
| Vulnerability Management | 30% | Identify, prioritize, and remediate vulnerabilities across the enterprise |
| Incident Response & Management | 20% | Detect, contain, and remediate security incidents using structured IR processes |
| Reporting & Communication | 17% | Communicate security findings and metrics to stakeholders effectively |
A passing study plan usually trails the weighting: spend the most sessions on Security Operations (33%), then check the next domain down before moving on. If your accuracy on a high-weight domain stays under 80%, more practice there is worth more than another pass at a low-weight topic.
These questions come from the CompTIA CySA+ (CS0-003) practice bank. Read the rationale even when you answer correctly — the explanation is usually where the exam technique lives.
Investigators suspect an employee of staging outbound data from a file server that also shows an unexplained component in memory. The employee's manager wants the server restarted to clear the anomaly, but the investigator objects that a restart would destroy the evidence trail. Which action should the investigator take before the server is restarted?
Answer: C. Option C is correct because the suspicious activity is held in the volatile memory of the server, so extracting that memory contents before any reboot preserves the evidence the manager would otherwise erase. Option A isolates hosts to limit spread but does not capture the live data. Option B preserves records for possible litigation rather than acquiring volatile state. Option D documents disk media, which does not hold what is lost on restart.
An executive asks the SOC manager for a single metric that proves the security program is improving. The manager wants to avoid a misleading number that improves on paper while real risk stays flat. Which reporting approach is most defensible?
Answer: A. Option A is correct. A defensible metric program pairs leading indicators such as detection coverage and mean time to detect with outcome indicators such as confirmed incident count and dwell time, so improvement is measured against real risk rather than a single vanity number. Option B is incorrect because a rising alert count can reflect noisy detections or more attacks rather than genuine improvement. Option C is incorrect because presenting MTTD and MTTR in isolation omits whether detections are true positives and whether incidents are actually being reduced. Option D is incorrect because closed vulnerabilities alone do not show whether the most important risks were addressed or whether breaches are decreasing.
A threat hunter wants to find attackers who have already bypassed perimeter defenses and are moving inside the network. Rather than wait for alerts, the hunter forms a hypothesis and searches telemetry for evidence that either confirms or refutes it. Which hypothesis is the most productive starting point?
Answer: C. Option C is correct. A productive hunt begins with a specific, testable hypothesis: compromised accounts running reconnaissance commands across hosts before unusual logins, which directs a targeted search of telemetry rather than a blind one. Option D is incorrect because assuming the perimeter stops all attacks forecloses the search before it begins. Option A is incorrect because the absence of alerts does not prove the absence of an attacker, since detection tools can miss tradecraft. Option B is incorrect because random sampling without a hypothesis is inefficient and easily misses intrusions.
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The CS0-003 exam is organised into 4 domains: Security Operations (33%), Vulnerability Management (30%), Incident Response & Management (20%), Reporting & Communication (17%). The weighting above shows how much of the exam each domain represents, so budget study time in the same proportion.
The CS0-003 exam has approximately 85 questions in 165 minutes, with a passing score of 750. Practice sets here are scored the same way as the real exam so you can see whether you are above or below the line before test day.
Start with Security Operations, the highest-weighted domain, then work down the list. Answer a mixed set after each domain pass — mixing domains forces you to identify what a question is asking before recalling the content, which is what the real exam does.
No. These are original practice questions written against the published CS0-003 exam objectives. They mirror the style, difficulty, and domain weighting of the real exam, but the actual exam content is confidential and is not reproduced here.