ISC2 CC Security Operations Practice Question
What is the primary purpose of a Security Information and Event Management (SIEM) system?
⚠ Common exam trap
Watch out — candidates often confuse SIEM (detect and alert via correlation) with tools that block or encrypt — candidates pick 'block malicious traffic' because they conflate SIEM with IPS/firewall.
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
✓
Aggregate and correlate logs to generate alerts
A SIEM's core function is to aggregate log and event data from many sources, normalize it, and correlate events across systems to detect and alert on security incidents. Correlation is what distinguishes a SIEM from simple log collection — it identifies patterns spanning multiple events that individually look benign.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Encrypt sensitive data at rest
Why it's wrong here
Encryption at rest is provided by storage, database or disk-level controls, not by a SIEM. SIEM's primary purpose is centralising and correlating security event data to detect and investigate incidents. The option tempts because SIEM logs may record encryption key operations, but it neither performs nor manages the encryption itself.
- ✗
Manage user passwords and access controls
Why it's wrong here
Password and access control management belongs to identity and access management platforms such as Microsoft Entra ID, not SIEM. A SIEM aggregates and correlates log events from many sources to surface incidents; it does not administer credentials. This option is tempting because authentication events do feed SIEM detections, but provisioning and password policy sit elsewhere.
- ✓
Aggregate and correlate logs to generate alerts
Why this is correct
A SIEM collects log and event data from across the estate, then correlates it to detect patterns indicating incidents and raises alerts. This aggregation and correlation capability is its primary purpose, satisfying the stem's requirement.
- ✗
Block malicious network traffic in real time
Why it's wrong here
Real-time traffic blocking is the function of firewalls, IPS or EDR controls sitting inline on the network path. A SIEM is passive: it collects, normalises and correlates logs, then raises alerts for analysts. The option tempts because SIEM alerts often trigger automated response playbooks, but the blocking itself is performed by those enforcement tools.
Go deeper
Related to this question
Learn chapter
Incident Response and Management
Key term
Security Information and Event Management
A system that collects, analyzes, and reports on security data from across an IT environment to detect and respond to threats.
Key term
SIEM
SIEM (Security Information and Event Management) is a system that collects and analyzes log data from across an IT environment to detect and respond to security threats in real time.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official ISC2 exam blueprint
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.