easyMultiple Choice
ISC2 CC Practice Question: Is the primary purpose of a security information…
Which of the following is the primary purpose of a security information and event management (SIEM) system?
⚠ Common exam trap
ISC2 often tests the distinction between a SIEM's core function (correlation and detection) and other security tools' roles (prevention, enforcement, or replacement of manual tasks), leading candidates to mistakenly choose 'replace manual log review' because they overlook the primary purpose of incident detection.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Correlate and analyze log data to detect incidents.
The primary purpose of a SIEM system is to aggregate, correlate, and analyze log data from multiple sources (e.g., firewalls, servers, IDS/IPS) in real time to detect security incidents. By applying correlation rules and analytics, SIEM identifies patterns or anomalies that indicate malicious activity, enabling security teams to respond promptly.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enforce access control policies.
Why it's wrong here
A SIEM aggregates and correlates log and event data to detect and alert on threats; access control enforcement belongs to identity and network policy systems such as Microsoft Entra ID conditional access or firewalls. It is tempting because SIEM alerts often trigger automated responses, but the platform itself does not gate user or device access.
- ✗
Replace the need for manual log review.
Why it's wrong here
A SIEM centralises and correlates logs but still requires analysts to triage alerts, tune rules and investigate anomalies; it supplements manual review rather than removing it. It is tempting because automation handles high-volume correlation that no human could perform, yet judgement on context and false positives remains human work.
- ✗
Prevent malware infections.
Why it's wrong here
A SIEM detects and alerts on malicious activity after telemetry is generated; it does not block execution, scan files or quarantine endpoints, which is the role of EDR and antivirus. It is tempting because detection and response workflows can trigger containment actions, but prevention at the point of infection sits elsewhere.
- ✓
Correlate and analyze log data to detect incidents.
Why this is correct
SIEM platforms aggregate logs from disparate sources, then apply correlation rules and analytics to link related events across systems. This correlation is what surfaces multi-stage incidents that individual device logs would not reveal, satisfying the stem's requirement for detecting incidents rather than merely storing or forwarding raw log data.
Go deeper
Related to this question
Learn chapter
Incident Response and Management
Key term
IDS
An IDS is a security system that monitors network or system traffic for suspicious activity and alerts administrators to potential threats, but does not actively block them.
Key term
IPS
An Intrusion Prevention System (IPS) is a network security device that monitors traffic in real time and automatically blocks threats before they reach your systems.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CC practice question is part of Courseiva's free ISC2 certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CC exam.