CompTIA · CS0-003
CompTIA CySA+ validates the skills required to detect, analyze, and respond to cybersecurity threats through continuous security monitoring. It covers security operations, vulnerability management, incident response, and security reporting for intermediate-level cybersecurity analysts.
Practice Questions
700
≈ 7 practice exams
Duration
165 minutes
Passing Score
750/900
Difficulty
ProfessionalLast Updated
Mar 2026
Use this CS0-003 practice exam to prepare for CompTIA Cybersecurity Analyst+ (CySA+) (CS0-003) with realistic questions, detailed explanations, and focused study modes. The practice bank includes 700 questions for CompTIA CS0-003, so you can review the exam steadily instead of relying on one long cram session.
As you practice, pay extra attention to recurring topics such as Security Operations, Vulnerability Management, Incident Response Management, Reporting and Communication, and Threat Intelligence and Threat Hunting. Start with short sessions to identify weak areas, then move into timed quizzes once your accuracy is consistent.
The explanations are especially useful when you want to connect exam wording to the responsibilities and scenarios described in the official certification guidance. Use the free preview first, then unlock the full question bank when you are ready to build a complete study routine.
The CompTIA Cybersecurity Analyst+ (CySA+) is the premier certification for intermediate-level cybersecurity professionals responsible for continuous security monitoring, detection, and response. Launched in June 2023 as version 3, this professional-level certification validates expertise in security operations, vulnerability management, incident response, and threat analysis through real-world scenarios and performance-based assessments. The certification emphasizes the critical technical and communication skills necessary for security analysts, SOC (Security Operations Center) analysts, and incident responders to effectively detect, analyze, prioritize, and communicate about cybersecurity threats across enterprise networks and security infrastructure.
The CySA+ certification is designed for intermediate to advanced IT professionals with hands-on cybersecurity experience who are transitioning into or advancing within security operations roles. The target audience includes incident response analysts, SOC analysts, threat intelligence specialists, security engineers, and security operations managers. Candidates should have a minimum of 4 years of hands-on information security or cybersecurity job role experience, preferably with exposure to incident response, threat detection, or security monitoring. This certification is ideal for professionals seeking to validate their expertise in threat detection and incident response or those pursuing career advancement from entry-level security positions (such as Security+ certified professionals) into specialized analyst and operational security roles.
CompTIA recommends candidates hold CompTIA Network+, Security+, or equivalent knowledge before pursuing CySA+. The primary prerequisite is a minimum of 4 years of hands-on, direct experience in information security or cybersecurity roles, specifically as an incident response analyst, security operations center (SOC) analyst, or equivalent position involving continuous security monitoring and threat detection. While formal certification prerequisites are not strictly enforced, CompTIA strongly advises that candidates possess practical experience with security tools, vulnerability assessment methodologies, incident response procedures, and security operations processes before attempting the examination. Candidates should also have foundational knowledge of network architecture, operating systems, and basic security principles.
The CySA+ (CS0-003) exam lasts 165 minutes and contains a maximum of 85 questions consisting of a mix of multiple-choice and performance-based questions (PBQs). The exam uses a scaled scoring system ranging from 100 to 900, with a passing score of 750. Performance-based questions simulate real-world security scenarios requiring hands-on analysis using tools such as Splunk, Wireshark, and Nessus to investigate malicious activity, assess vulnerabilities, and respond to security incidents. The exam is delivered via Pearson VUE testing centers (in-person) and may also be available through remote proctoring options. The version 3 (CS0-003) launched on June 6, 2023, with a typical retirement date three years after launch.
The CySA+ certification significantly enhances career prospects in the cybersecurity field, with certified professionals commanding average salaries of $106,490 in the U.S., with typical ranges between $85,000 and $115,000 depending on experience level, location, and employer size. Entry-level CySA+ positions start around $65,000, while experienced professionals frequently exceed $110,000 annually, with many analysts reporting salary increases of $10,000-$20,000 immediately after certification. The certification qualifies candidates for specialized, in-demand roles including Security Analyst ($80,000-$100,000), SOC Analyst ($90,000-$110,000), Threat Intelligence Analyst, and Incident Responder positions that exist across virtually every industry. CySA+ is DoD (Department of Defense) approved and recognized by major corporations, government agencies, and critical infrastructure organizations as proof of practical threat detection and incident response competency. The job market for information security analysts is expanding rapidly (projected 33% growth over ten years), and CySA+ holders' expertise in threat detection, vulnerability management, and incident response directly aligns with urgent organizational security needs.
5 sample questions with answers and explanations. The full bank has 700 questions, enough for 7 full-length practice exams.
Preview — answers shown1. Adatum Corporation's security analyst is reviewing Nmap scan results and encounters the following output for a target host: '80/tcp open|filtered http'. Which Nmap scan type MOST likely produced this result? (Select one!)
Explanation
The open|filtered state is characteristic of NULL, FIN, and Xmas scans. These scan types cannot distinguish between open and filtered ports because they rely on the absence of a response to indicate an open port. When no RST packet is received, the scanner cannot determine whether the port is open (service accepted the packet silently) or filtered (a firewall dropped the packet). The Xmas scan sends packets with FIN, PSH, and URG flags set. TCP SYN scans produce definitive open, closed, or filtered results based on SYN/ACK or RST responses. TCP Connect scans complete the full three-way handshake and also produce definitive results. TCP ACK scans are used to map firewall rules and report ports as filtered or unfiltered, not open|filtered.
2. Adatum's security team is evaluating Linux authentication logs on a Debian-based web server after receiving reports of unauthorized SSH access attempts. Which log file should the analyst examine FIRST to identify failed SSH login attempts? (Select one!)
Explanation
On Debian and Ubuntu-based Linux distributions, /var/log/auth.log is the primary log file that records all authentication-related events including SSH login attempts, sudo usage, and PAM authentication messages. This file will contain detailed records of both successful and failed SSH connection attempts with source IP addresses and usernames. The /var/log/syslog file on Debian systems contains general system activity but authentication events are specifically directed to auth.log. The /var/log/secure file serves the same purpose as auth.log but is used on RHEL and CentOS-based distributions, not Debian. The /var/log/messages file is the general system log on RHEL/CentOS systems, not Debian.
3. Adatum Corporation's security team is creating vendor-agnostic detection rules that can be deployed across their Splunk, Microsoft Sentinel, and Elastic SIEM environments without rewriting each rule from scratch. Which detection rule format should they adopt? (Select one!)
Explanation
Sigma rules are YAML-based, vendor-agnostic detection rule format designed to be written once and converted to platform-specific query languages like SPL (Splunk), KQL (Microsoft Sentinel), and Lucene/EQL (Elastic) using conversion tools such as pySigma or sigma-cli. This makes Sigma ideal for organizations that operate multiple SIEM platforms. YARA rules are designed for malware identification and file pattern matching, not SIEM detection rule creation. Snort signatures are IDS/IPS-specific and cannot be used across SIEM platforms for log-based detection. STIX indicators are a JSON-based format for sharing threat intelligence data, not for writing SIEM detection rules.
4. Contoso's Linux security analyst is reviewing authentication logs on an Ubuntu server after receiving alerts about suspicious SSH activity. Which log file should the analyst examine FIRST to investigate SSH authentication events on this system? (Select one!)
Explanation
On Debian-based Linux distributions including Ubuntu, SSH authentication events are recorded in /var/log/auth.log. This file captures all authentication-related events including SSH login attempts (successful and failed), sudo usage, and PAM module activity. The /var/log/messages file is used on RHEL/CentOS-based distributions for general system activity but is not the primary authentication log on Ubuntu. The /var/log/secure file serves the same purpose as auth.log but is specific to RHEL/CentOS-based distributions and does not exist by default on Ubuntu systems. The /var/log/audit/audit.log file is created by the auditd daemon for detailed system call tracking and compliance auditing, but it requires auditd to be explicitly installed and configured, and is not the default location for SSH authentication events on Ubuntu.
5. Northwind Traders' SOC analyst is investigating a Linux server compromise. The analyst needs to review authentication events to identify unauthorized SSH login attempts. The server runs Ubuntu 22.04. Which log file should the analyst examine FIRST? (Select one!)
Explanation
/var/log/auth.log is the correct log file for authentication events on Debian-based distributions including Ubuntu. This log captures SSH authentication attempts, sudo usage, and other authentication-related events. /var/log/secure serves the same purpose but is used on Red Hat-based distributions such as RHEL and CentOS, not Ubuntu. /var/log/messages is the general system log on RHEL/CentOS systems and does not specifically focus on authentication events. /var/log/audit/audit.log is used by the auditd subsystem for detailed system call tracking and is useful for compliance auditing but is not the primary authentication log and requires auditd to be installed and configured.
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