The answer is to isolate the affected instance, tag the resource, and snapshot the EBS volumes. Isolating the instance by modifying its security group to block all traffic is a critical containment step that stops malicious network activity without destroying volatile evidence, allowing for safe forensic analysis. Tagging the resource with a clear incident identifier ensures the finding is tracked and not overlooked during remediation, while creating a snapshot preserves the disk state for deep forensic investigation. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding of the incident response lifecycle—contain, preserve, and track—often appearing as a multi-select question where distractors include terminating the instance immediately or deleting the finding. A common trap is choosing “terminate the instance” because it seems fast, but that destroys evidence. Remember the mnemonic: **I-T-S** (Isolate, Tag, Snapshot) to keep your response orderly and forensically sound.
SCS-C02 Threat Detection and Incident Response Practice Question
This SCS-C02 practice question tests your understanding of threat detection and incident response. 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 team is implementing automated response to AWS GuardDuty findings. Which THREE actions should be taken to ensure proper incident response?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an AWS Lambda function that automatically modifies the security group of the affected instance to block all traffic.
Option A is correct because isolating the affected instance by modifying its security group to block all traffic is a common containment strategy that stops malicious network activity without destroying evidence. This approach allows the security team to perform forensic analysis and remediation while preventing further compromise, aligning with AWS incident response best practices.
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.
✓
Create an AWS Lambda function that automatically modifies the security group of the affected instance to block all traffic.
Why this is correct
Containment action.
Related concept
Read the scenario before looking for a memorised answer.
✓
Tag the affected instance with a 'quarantine' tag for tracking.
Why this is correct
Helps with incident management.
Related concept
Read the scenario before looking for a memorised answer.
✓
Create a snapshot of the EBS volumes attached to the instance for forensic analysis.
Why this is correct
Preserves evidence.
Related concept
Read the scenario before looking for a memorised answer.
✗
Terminate the affected instance immediately to neutralize the threat.
Why it's wrong here
May destroy evidence.
✗
Disable AWS CloudTrail to prevent further logging of malicious activity.
Why it's wrong here
Reduces visibility.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think immediate termination (Option D) is the fastest way to neutralize a threat, but AWS incident response frameworks emphasize containment and evidence preservation over destruction.
Detailed technical explanation
How to think about this question
When a GuardDuty finding indicates a compromised EC2 instance, the recommended first step is containment, not destruction. Modifying the security group to revoke all inbound and outbound rules (e.g., setting `IpPermissions` to an empty list) effectively quarantines the instance at the network layer, preserving the instance's state for forensic analysis. Tagging with a 'quarantine' tag (Option B) enables automated tracking and lifecycle management, while creating an EBS snapshot (Option C) captures the disk state for offline analysis without risking data loss from live acquisition.
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 AWS Lambda function that automatically modifies the security group of the affected instance to block all traffic. — Option A is correct because isolating the affected instance by modifying its security group to block all traffic is a common containment strategy that stops malicious network activity without destroying evidence. This approach allows the security team to perform forensic analysis and remediation while preventing further compromise, aligning with AWS incident response best practices.
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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