The answer is to determine the root cause of the incident before eradication begins. This step is technically critical because eradication aims to remove every trace of the adversary’s presence; without a root cause analysis, you might eliminate the symptom while leaving the original vulnerability or access vector intact, allowing the attacker to simply re-enter. On the CompTIA SecurityX CAS-004 exam, this concept tests your understanding of the incident response lifecycle, specifically the logical sequence where containment buys time for analysis before you commit to cleanup. A common trap is assuming eradication follows containment immediately, but the exam emphasizes that forensics and root cause analysis must occur first to ensure complete removal and prevent re-infection. Remember the mnemonic “CARE” — Contain, Analyze, Root cause, then Eradicate — to keep the order straight.
CAS-004 Security Operations Practice Question
This CAS-004 practice question tests your understanding of security operations. 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.
After containing a confirmed security incident, the incident response team must plan for eradication. What must be done before eradication begins?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Determine the root cause of the incident
Option C is correct because understanding the root cause ensures complete removal of the threat and prevents re-infection. Option A is wrong that eradication is the next step after containment; root cause analysis is critical. Option B is wrong because forensics can be done during or after eradication. Option D is wrong because notifying law enforcement is optional and not a prerequisite.
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.
✗
Conduct a full forensic analysis of all systems
Why it's wrong here
Forensics can happen in parallel but root cause analysis is more targeted.
✓
Determine the root cause of the incident
Why this is correct
Root cause analysis ensures eradication addresses the entry point and method.
Related concept
Read the scenario before looking for a memorised answer.
✗
Begin eradication immediately to minimize dwell time
Why it's wrong here
Eradication without root cause may leave residual threats.
✗
Notify law enforcement agencies
Why it's wrong here
Law enforcement notification is based on policy and not required before eradication.
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 CAS-004 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 CAS-004 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.
Security Operations — This question tests Security Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Determine the root cause of the incident — Option C is correct because understanding the root cause ensures complete removal of the threat and prevents re-infection. Option A is wrong that eradication is the next step after containment; root cause analysis is critical. Option B is wrong because forensics can be done during or after eradication. Option D is wrong because notifying law enforcement is optional and not a prerequisite.
What should I do if I get this CAS-004 question wrong?
Identify which CAS-004 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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Question Discussion
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