- A
Revoke the IAM role associated with the instance.
Why wrong: Revoking the role may stop API calls but does not stop network-level activity.
- B
Create a snapshot of the instance volume for forensic analysis.
Why wrong: Snapshot is good for evidence, but containment should come first to stop the attack.
- C
Terminate the EC2 instance immediately.
Why wrong: Termination destroys evidence and may not stop ongoing exfiltration if other instances are involved.
- D
Modify the security group associated with the instance to deny all traffic.
This isolates the instance, stopping further malicious activity.
Question 94 of 1,000
CCSP Cloud Security Operations Practice Question
This CCSP practice question tests your understanding of cloud 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.
During a cloud security incident, the incident response team needs to contain a compromised EC2 instance. Which action should be taken FIRST to prevent further malicious activity while preserving evidence?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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
✓
Modify the security group associated with the instance to deny all traffic.
Option D is correct because modifying the security group to deny all traffic immediately isolates the compromised EC2 instance, preventing further malicious network activity while preserving the instance's state for forensic analysis. This containment step is reversible and does not destroy volatile data or system processes, unlike termination or snapshot creation, which can alter evidence.
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.
- ✗
Revoke the IAM role associated with the instance.
Why it's wrong here
Revoking the role may stop API calls but does not stop network-level activity.
- ✗
Create a snapshot of the instance volume for forensic analysis.
Why it's wrong here
Snapshot is good for evidence, but containment should come first to stop the attack.
- ✗
Terminate the EC2 instance immediately.
Why it's wrong here
Termination destroys evidence and may not stop ongoing exfiltration if other instances are involved.
- ✓
Modify the security group associated with the instance to deny all traffic.
Why this is correct
This isolates the instance, stopping further malicious activity.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between containment and preservation, and the trap here is that candidates mistakenly choose snapshot creation (Option B) as the first step, confusing forensic preservation with immediate containment, or choose IAM role revocation (Option A) thinking it stops all activity, when it only affects AWS API calls, not network traffic.
Detailed technical explanation
How to think about this question
Security groups in AWS act as a stateful virtual firewall at the instance level; modifying the inbound and outbound rules to deny all traffic (e.g., setting both to 'Deny' for all protocols and ports) effectively quarantines the instance without stopping the operating system or services. This allows incident responders to later perform live forensics (e.g., memory capture via AWS Systems Manager or third-party tools) before taking further actions like snapshotting or termination. In a real-world scenario, an attacker may have established a reverse shell or C2 channel; blocking traffic at the security group cuts that channel instantly while preserving the process list and network connections for analysis.
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.
TExam Day Tips
- 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 SOC analyst notices unusual lateral movement in the network at 2 AM. The IR playbook dictates: identify and contain (isolate the affected machine), then eradicate (remove the malware), then recover (restore from backup), then document. Skipping containment before eradication risks the attacker regaining access. Questions like this test the sequence and rationale of incident response phases.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this CCSP question test?
Cloud Security Operations — This question tests Cloud Security Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Modify the security group associated with the instance to deny all traffic. — Option D is correct because modifying the security group to deny all traffic immediately isolates the compromised EC2 instance, preventing further malicious network activity while preserving the instance's state for forensic analysis. This containment step is reversible and does not destroy volatile data or system processes, unlike termination or snapshot creation, which can alter evidence.
What should I do if I get this CCSP question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
This CCSP 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 CCSP exam.
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