- A
Terminate the EC2 instance immediately.
Why wrong: Termination may destroy evidence; containment is preferred initially.
- B
Take a snapshot of the instance for forensic analysis.
Why wrong: Snapshots are for evidence collection, but containment should come first to stop active threats.
- C
Isolate the EC2 instance by updating the security group to deny all traffic.
Modifying the security group effectively isolates the instance.
- D
Disable the IAM role attached to the instance.
Why wrong: While helpful, it doesn't stop network-level access; isolation is more immediate.
Question 469 of 1,000
CCSP Cloud Security Operations Practice Question
This CCSP practice question tests your understanding of cloud security operations. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 security analyst is investigating a potential compromise of an AWS EC2 instance. Which step should be taken FIRST to contain the incident and prevent further damage?
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
✓
Isolate the EC2 instance by updating the security group to deny all traffic.
Option C is correct because the first priority in incident response is containment. Updating the security group to deny all traffic immediately isolates the EC2 instance from network communication, preventing lateral movement or data exfiltration while preserving the instance for further investigation. This aligns with the NIST SP 800-61 incident response framework, which emphasizes containment before eradication or recovery.
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.
- ✗
Terminate the EC2 instance immediately.
Why it's wrong here
Termination may destroy evidence; containment is preferred initially.
- ✗
Take a snapshot of the instance for forensic analysis.
Why it's wrong here
Snapshots are for evidence collection, but containment should come first to stop active threats.
- ✓
Isolate the EC2 instance by updating the security group to deny all traffic.
Why this is correct
Modifying the security group effectively isolates the instance.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Disable the IAM role attached to the instance.
Why it's wrong here
While helpful, it doesn't stop network-level access; isolation is more immediate.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that immediate termination (Option A) is the fastest containment method, but the trap is that termination destroys forensic evidence and violates the 'preserve evidence' principle of incident response.
Detailed technical explanation
How to think about this question
Security groups act as a stateful virtual firewall at the instance level, and updating them to deny all traffic (e.g., removing all inbound and outbound rules) effectively cuts off all network interfaces (eth0, etc.) without requiring instance reboot or stopping. This is distinct from network ACLs, which are stateless and require explicit deny rules for both directions. In a real-world scenario, an attacker using a reverse shell or C2 beacon would be immediately blocked, while the instance remains running for memory forensics (e.g., using LiME or volatility) and disk 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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Cloud Security Operations — study guide chapter
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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: Isolate the EC2 instance by updating the security group to deny all traffic. — Option C is correct because the first priority in incident response is containment. Updating the security group to deny all traffic immediately isolates the EC2 instance from network communication, preventing lateral movement or data exfiltration while preserving the instance for further investigation. This aligns with the NIST SP 800-61 incident response framework, which emphasizes containment before eradication or recovery.
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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