- A
Take a forensic snapshot of the instance’s EBS volume
Why wrong: Snapshot should be taken after isolation to preserve evidence, but isolation is the priority.
- B
Revoke the IAM credentials associated with the instance’s role
Why wrong: This prevents API calls but does not stop network traffic.
- C
Stop the EC2 instance
Why wrong: Stopping the instance disrupts operations and may lose volatile data; isolation via security group is less disruptive.
- D
Modify the security group to deny all outbound traffic
This immediately stops all network communication from the instance.
Question 422 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 incident response, a security team needs to isolate a compromised EC2 instance to prevent further communication with an external command-and-control server. Which step should be taken first?
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 to deny all outbound traffic
Modifying the security group to deny all outbound traffic is the fastest way to cut communication between the compromised EC2 instance and the external C2 server without destroying volatile data. Security groups act as a stateful virtual firewall at the instance level, and changing the outbound rule to deny all traffic immediately blocks any existing or new connections to the C2 IP. This preserves the instance's runtime state for later forensic analysis while containing the threat.
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.
- ✗
Take a forensic snapshot of the instance’s EBS volume
Why it's wrong here
Snapshot should be taken after isolation to preserve evidence, but isolation is the priority.
- ✗
Revoke the IAM credentials associated with the instance’s role
Why it's wrong here
This prevents API calls but does not stop network traffic.
- ✗
Stop the EC2 instance
Why it's wrong here
Stopping the instance disrupts operations and may lose volatile data; isolation via security group is less disruptive.
- ✓
Modify the security group to deny all outbound traffic
Why this is correct
This immediately stops all network communication from 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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between containment (blocking network traffic) and preservation (snapshotting or stopping), and the trap here is that candidates mistakenly choose 'Stop the EC2 instance' thinking it is the most definitive containment action, not realizing it destroys volatile evidence and is slower to implement than a security group change.
Detailed technical explanation
How to think about this question
Security groups are stateful, meaning that if you deny outbound traffic, the associated inbound response traffic is automatically dropped as well, effectively killing any established TCP connections (e.g., HTTPS to the C2 server). Under the hood, AWS implements security groups as a set of iptables-like rules in the hypervisor layer, so the change propagates within seconds across all ENIs attached to the instance. In a real-world scenario, the security team would first apply a 'deny all outbound' security group rule, then optionally use VPC Flow Logs to confirm the C2 traffic has ceased before proceeding with memory acquisition or snapshot creation.
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 to deny all outbound traffic — Modifying the security group to deny all outbound traffic is the fastest way to cut communication between the compromised EC2 instance and the external C2 server without destroying volatile data. Security groups act as a stateful virtual firewall at the instance level, and changing the outbound rule to deny all traffic immediately blocks any existing or new connections to the C2 IP. This preserves the instance's runtime state for later forensic analysis while containing the threat.
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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