CS0-003 Sample Questions and the 750 Passing Score Explained

The Short Answer: 750 to Pass, Up to 85 Questions in 165 Minutes

To pass CompTIA CySA+ CS0-003 you need a scaled score of 750 on a 100–900 scale. That is not a percentage — CompTIA weights items by difficulty, so nobody can honestly convert 750 into an exact number of questions you may miss. The format you can plan around is a maximum of 85 questions in 165 minutes, combining multiple-choice questions with performance-based questions (PBQs) that simulate analyst work: reading logs, interpreting scan output, triaging an incident.

The five questions below are original, written for this article. They are not leaked exam content — material sold as "real questions" is a dump, and using one risks your certification — see whether CS0-003 practice tests are accurate and safe for how to tell. What legitimate samples mirror is the judgement the exam rewards. Notice that the wrong answers are seldom absurd; they are usually the second-best action, taken at the wrong time or for the wrong reason.

Five Worked Sample Questions

Sample question 1. An authentication log for a VPN gateway shows 214 failed logins against one administrator's account from a single external IP address in 40 minutes, followed by one successful login from the same address at 03:17. What should the analyst do first?

• A. Close the event as a false positive, because the successful login used valid credentials
• B. Treat the account as compromised: force a password reset, block the source address, and escalate under the incident response plan
• C. Monitor the account for 24 hours to see whether the behaviour repeats
• D. Add the source address to an allow list so the administrator is not locked out again

Answer: B. A run of failures ending in a success is the signature of a brute-force attack that worked — the valid credentials are the problem, not the exoneration, and the account is privileged. Containment and escalation come first. A reads the success as innocence; C hands a successful intruder a full day of dwell time; D actively protects the attacker's access route.

Sample question 2. A vulnerability scan returns four findings: a critical flaw with a publicly available exploit on an internet-facing web server (CVSS 9.8); a critical flaw on an isolated lab workstation with no production connectivity (CVSS 9.1); a high-severity flaw on a database server reachable only from the application tier; and a medium finding on an internal file server. Which finding should be remediated first?

• A. The critical vulnerability on the isolated lab workstation
• B. The critical vulnerability on the internet-facing web server
• C. The medium-severity finding on the internal file server
• D. All four, in the order the scanner reported them

Answer: B. Priority is risk, and risk is exploitability multiplied by exposure. A known exploit on an internet-facing server can be attempted by anyone, today. The lab workstation is the strongest distractor — a near-identical score, but isolation collapses its exposure, so it waits. D fails because scanner report order is arbitrary; triage that ignores context is not triage.

Sample question 3. A threat intelligence report provides three indicators for a current campaign: a malicious file hash, a command-and-control domain, and a behaviour — a process injecting into a legitimate system process and beaconing outbound every 60 seconds. What is the best use of this indicator set?

• A. Block the domain at the web proxy and consider the matter closed
• B. Build a threat-hunting query from all three indicators and sweep the environment for matching hosts
• C. Discard the file hash, because an attacker can change a file's hash trivially
• D. Wait for the endpoint vendor to publish a signature update for the campaign

Answer: B. Indicators exist to find what is already inside. Blocking the domain (A) is a fine supporting control, but it reveals nothing about hosts that beaconed yesterday. Discarding the hash (C) throws away a cheap, precise matching key, and waiting for a vendor (D) outsources your detection timeline. The behaviour is the most durable indicator of the three — hunt on the full set.

Sample question 4. An analyst is reviewing summaries of network activity from the past hour. Which pattern best indicates a port scan of the internal network?

• A. A single internal host downloading a 4 GB file from a vendor update server over HTTPS
• B. One external address sending brief connection attempts to dozens of internal hosts across hundreds of different ports within a few minutes
• C. Hundreds of employees authenticating to the same web application during the morning logon period
• D. A mail server delivering a company newsletter to several thousand external recipients

Answer: B. A scan has a shape: one source, many hosts, many ports, brief connections, compressed in time — reconnaissance mapping what exists and what is open. The other options are high-volume but structurally ordinary: a one-to-one download, many-to-one logons, one-to-many mail delivery. Interpretation questions reward reading the pattern in the output, not reacting to the volume.

Sample question 5. An incident has been contained and eradicated. Management asks for a document explaining what happened, the business impact, how the response performed, and what should change to prevent a recurrence. Which artefact should the analyst produce?

• A. The raw packet capture recorded by the intrusion detection sensor
• B. The post-incident report, including lessons learned and recommendations
• C. An unfiltered export of the firewall logs covering the incident window
• D. The latest vulnerability scan results for the affected systems

Answer: B. Packet captures, log exports, and scan results are evidence — they support analysis, but they do not synthesise it. The post-incident report is the communication product: timeline, impact, root cause, response effectiveness, and corrective actions, written for decision-makers. Options A, C, and D fail on audience and purpose, however valuable the underlying data was during the investigation.

Handling the Performance-Based Questions

PBQs are where the 165 minutes stop feeling generous. A single simulation — working a log console, interpreting a scan, stepping through an incident scenario — can absorb ten minutes or more, while a routine multiple-choice item takes under one. Two habits protect you. First, when a PBQ appears, open it and judge its cost; if it looks heavy, flag it and move on. Bank time on the multiple-choice bulk, then return with a known reserve instead of discovering at minute 150 that two simulations are still untouched. Second, never leave a PBQ blank: methodical partial work on a multi-part task is worth more than a pristine empty screen, and partial progress often unlocks the rest of the scenario.

Rehearse the workflow, not just the content. Full-length timed sittings teach you what a ten-minute question feels like — and that calibration is a large part of what exam day actually tests.

Read Your Practice Scores by Domain, Not Just in Total

CySA+ reports across four domains: Security Operations (roughly a third of the exam), Vulnerability Management (roughly 30%), Incident Response and Management (roughly 20%), and Reporting and Communication (the remainder). A single overall practice score hides the signal — 78% on average with one domain at 55% is a failing profile wearing a passing costume. Track every practice set per domain and aim your remaining study at the weakest one first; that is where the questions you are most likely to miss are concentrated. Timed, domain-scored practice, including the free practice tests on Study4Pass, makes that breakdown automatic instead of something you have to reconstruct by hand. Before you sit, it is worth confirming how much the CS0-003 exam costs and checking the CompTIA retake policy, so a failed first attempt never catches you unprepared.