SCS-C02 Threat Detection and Incident Response Practice Question
This SCS-C02 practice question tests your understanding of threat detection and incident response. 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.
A security engineer is configuring automated incident response for an Amazon EC2 instance that has been compromised. The engineer needs to isolate the instance while preserving forensic data. Which solution meets these requirements?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an AMI of the instance, then remove the instance from the security group to isolate it.
Option C is correct because creating an AMI preserves the EBS volumes and their forensic data, while removing the instance from the security group effectively isolates it by denying all network traffic. This approach allows the engineer to later launch a forensic instance from the AMI in a controlled environment for analysis, without losing the compromised instance's state.
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.
✗
Detach the EBS volumes and attach them to a new instance in a different VPC.
Why it's wrong here
This requires stopping the instance, which may alter memory and disk state.
✗
Terminate the instance immediately to prevent further damage.
Why it's wrong here
Termination destroys forensic data and may not be reversible.
✓
Create an AMI of the instance, then remove the instance from the security group to isolate it.
Why this is correct
The AMI preserves the volume data, and removing from security group blocks traffic while keeping instance running.
Related concept
Read the scenario before looking for a memorised answer.
✗
Stop the instance and change the security group to deny all traffic.
Why it's wrong here
Stopping the instance may alter volatile data, and isolation is not maintained if instance is restarted.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think stopping the instance (Option D) is sufficient for isolation, but they overlook that stopping does not prevent an attacker from restarting the instance, and it can destroy volatile forensic data.
Detailed technical explanation
How to think about this question
Creating an AMI from a running instance triggers a point-in-time snapshot of all attached EBS volumes, ensuring data consistency if the instance is in a 'stopped' state or if the filesystem is frozen (e.g., using fsck or xfs_freeze). The security group removal isolates the instance at the network layer by removing all inbound/outbound rules, effectively dropping all traffic at the hypervisor level, which is more immediate than modifying individual rules. In real-world scenarios, this approach is used in AWS Security Incident Response playbooks to preserve evidence while containing the threat.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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.
Threat Detection and Incident Response — This question tests Threat Detection and Incident Response — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create an AMI of the instance, then remove the instance from the security group to isolate it. — Option C is correct because creating an AMI preserves the EBS volumes and their forensic data, while removing the instance from the security group effectively isolates it by denying all network traffic. This approach allows the engineer to later launch a forensic instance from the AMI in a controlled environment for analysis, without losing the compromised instance's state.
What should I do if I get this SCS-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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