The correct answer is to identify the root cause of the incident. After containment, the most important next step is root cause analysis because it directly addresses the underlying vulnerability or failure that allowed the incident to occur, enabling the team to implement corrective actions that prevent recurrence. On the Certified Information Security Manager CISM exam, this question tests your understanding of the incident response lifecycle, specifically the transition from containment to eradication and recovery. A common trap is confusing forensic imaging—which is performed during containment to preserve volatile evidence—with the post-containment priority of root cause identification. Another trap is jumping to notify law enforcement or update the incident response plan, both of which occur later in the post-incident review phase. Remember the memory tip: “Contain the scene, then find the ‘why’ before you update the plan or call the guy.”
CISM Incident Management Practice Question
This CISM practice question tests your understanding of incident management. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company's incident response team is conducting a tabletop exercise. They are discussing the steps after containment to prevent recurrence. The facilitator asks: 'What is the MOST important next step after containing an incident?' The team considers several options.
Root cause analysis is essential to prevent recurrence by addressing the underlying vulnerability or process gap.
B
Update the incident response plan with lessons learned
Why wrong: Updating the plan is part of post-incident review, which occurs after root cause analysis and remediation.
C
Forensically image all affected systems
Why wrong: Forensic imaging is part of containment and evidence preservation, not the immediate next step for prevention.
D
Notify law enforcement about the incident
Why wrong: Notification to law enforcement may be required but is not the primary action for prevention; it is typically done during or after containment.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Identify the root cause of the incident
Option B is correct because after containment, identifying root cause is crucial to implement corrective actions and prevent recurrence. Option A (forensic imaging) is typically done during containment to preserve evidence. Option C (notify law enforcement) may be required but is not the immediate next step for prevention. Option D (update the incident response plan) is part of post-incident review, not immediate.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Identify the root cause of the incident
Why this is correct
Root cause analysis is essential to prevent recurrence by addressing the underlying vulnerability or process gap.
Related concept
Read the scenario before looking for a memorised answer.
✗
Update the incident response plan with lessons learned
Why it's wrong here
Updating the plan is part of post-incident review, which occurs after root cause analysis and remediation.
✗
Forensically image all affected systems
Why it's wrong here
Forensic imaging is part of containment and evidence preservation, not the immediate next step for prevention.
✗
Notify law enforcement about the incident
Why it's wrong here
Notification to law enforcement may be required but is not the primary action for prevention; it is typically done during or after containment.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the CISM exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which CISM exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Incident Management — This question tests Incident Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Identify the root cause of the incident — Option B is correct because after containment, identifying root cause is crucial to implement corrective actions and prevent recurrence. Option A (forensic imaging) is typically done during containment to preserve evidence. Option C (notify law enforcement) may be required but is not the immediate next step for prevention. Option D (update the incident response plan) is part of post-incident review, not immediate.
What should I do if I get this CISM question wrong?
Identify which CISM exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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.
Question Discussion
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