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CAS-004 Practice Question: During an incident response exercise, a company…
During an incident response exercise, a company discovers that sensitive data was exfiltrated. The CIRT needs to determine the root cause and prevent recurrence. Which THREE of the following steps are part of the lessons learned process? (Choose THREE.)
⚠ Common exam trap
The CASP+ exam often tests the distinction between reactive incident response steps (forensics, containment) and the proactive, improvement-focused lessons learned phase, leading candidates to mistakenly include forensic analysis or immediate containment actions as part of lessons learned.
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
✓
Identify gaps in security controls and recommend improvements.
Identifying gaps in security controls and recommending improvements is a core component of the lessons learned phase. This step ensures that the root cause of the exfiltration is addressed by analyzing which controls failed (e.g., missing DLP rules, inadequate network segmentation) and proposing concrete enhancements to prevent recurrence.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Conduct a full forensic analysis of affected systems.
Why it's wrong here
Forensic analysis is part of the investigation phase, not specifically lessons learned.
- ✓
Identify gaps in security controls and recommend improvements.
Why this is correct
Identifying gaps and recommending improvements is a core lesson learned activity.
- ✓
Update the incident response plan based on findings.
Why this is correct
Updating the plan is a key outcome of lessons learned.
- ✓
Document the timeline of events and actions taken.
Why this is correct
Documenting the timeline is essential for lessons learned analysis.
- ✗
Disable the compromised accounts immediately.
Why it's wrong here
Disabling accounts is a containment step, not lessons learned.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CAS-005 practice question is part of Courseiva's free CompTIA 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 CAS-005 exam.