CompTIA CySA+ (CS0-003) Practice Exams

How the CS0-003 exam is structured

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.

Worked sample CS0-003 questions

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.

Sample question 1 — Incident Response & Management

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?

A. Isolate the affected hosts and stop ongoing malicious activity during containment.
B. Place a legal hold on relevant logs and data when litigation is reasonably anticipated.
C. Extract the live memory contents before the endpoint is rebooted or wiped.
D. Image the evidence with hashing and maintain chain-of-custody documentation.

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.

Sample question 2 — Reporting & Communication

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?

A. Pair leading indicators such as detection coverage and time to detect with outcome indicators such as confirmed incident count and dwell time.
B. Report only the total number of alerts generated, since a rising count demonstrates that monitoring coverage is expanding.
C. Report mean time to detect and mean time to respond in isolation, showing the trend line for each metric.
D. Report the number of vulnerabilities closed each month as the single headline indicator of program health.

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.

Sample question 3 — Security Operations

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?

A. No attacker is present because the antivirus and IDS have not generated any high-severity alerts this week.
B. Random sampling of a few workstations will surface all intrusions without the need for a specific hypothesis.
C. Compromised accounts are being used to run reconnaissance commands on many hosts shortly before unusual logins occur.
D. The perimeter firewall will block every future attack, so internal telemetry is unlikely to contain any evidence.

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.

How to use this CS0-003 practice set

Answer the 10 free questions without notes. Guessing is more useful than looking the answer up — the wrong answers tell you which domain to revisit.

Read every explanation, including the ones you got right. Note the reasoning for each distractor, not just the correct option.

Drill by domain, starting with Security Operations (33%), then take a mixed set so you practise switching between topics.

Finish with a timed practice exam. Aim to be consistently above the passing score before you book the real CS0-003 exam.

CS0-003 practice questions FAQ

How many free CS0-003 practice questions can I try?

You can answer 10 CS0-003 practice questions free without creating an account. Each one is graded instantly with a written explanation. A free account keeps your progress, and the full bank (300+ questions) unlocks with a subscription.

What topics does the CS0-003 exam cover?

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.

How long is the CS0-003 exam and how is it scored?

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.

How should I start studying for CompTIA CySA+ (CS0-003)?

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.

Are these the same questions that appear on the real CS0-003 exam?

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.

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