easyMultiple ChoiceObjective-mapped
CISM Practice Question: During a post-incident review, the incident…
During a post-incident review, the incident response team identifies that the root cause of a data breach was a misconfigured firewall rule that allowed unrestricted inbound access from the internet. Which corrective action BEST addresses this issue?
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
✓
Implement a change management process for firewall modifications
Implementing a change management process (D) ensures that firewall rule changes are reviewed and approved, preventing misconfigurations from recurring. A one-time review of all firewall rules (B) is temporary and does not address the underlying process failure. Increasing the frequency of penetration tests (A) may detect vulnerabilities but does not prevent misconfigurations. Restoring from a last known good backup (C) does not fix the process that led to the misconfiguration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Increase the frequency of penetration tests
Why it's wrong here
Increasing the frequency of penetration tests may help identify vulnerabilities but does not prevent future misconfigurations caused by lack of oversight.
- ✗
Conduct a one-time review of all firewall rules
Why it's wrong here
Conducting a one-time review of all firewall rules is a temporary fix; it does not establish a process to prevent similar issues.
- ✗
Restore the firewall configuration from the last known good backup
Why it's wrong here
Restoring the firewall configuration from the last known good backup addresses the immediate issue but fails to correct the underlying process that allowed the misconfiguration.
- ✓
Implement a change management process for firewall modifications
Why this is correct
Implementing a change management process ensures that all firewall modifications are reviewed and approved, directly addressing the root cause of the misconfiguration.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CISM practice question is part of Courseiva's free ISACA 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 CISM exam.