The answer is to apply a bucket policy that denies all principals access to the compromised S3 bucket. This action immediately revokes all permissions, effectively isolating the bucket and stopping any ongoing unauthorized data exfiltration or modification, which is the primary goal of containment in an incident response plan. On the AWS Certified Security Specialty SCS-C02 exam, this question tests your ability to distinguish between containment actions and detective controls, with a common trap being to select enabling CloudTrail data events—while critical for forensic analysis and logging object-level operations like GetObject or PutObject, it is a detective measure, not a direct containment step. Remember that containment must halt the attack first; logging comes after or in parallel but does not stop the breach. A useful memory tip: “Deny all to stop the fall, log the trail for the detail.”
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 engineer is designing an incident response plan for a compromised S3 bucket. Which TWO actions should be taken to contain the incident? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable CloudTrail data events for the bucket to log all object-level operations.
Enabling CloudTrail data events for the S3 bucket (Option C) is a critical detective control that logs all object-level operations (e.g., GetObject, PutObject, DeleteObject). This allows the security engineer to perform forensic analysis, identify the scope of the compromise, and understand the attacker's actions, which is essential for containment and remediation. While not a direct containment action, it is a necessary step to gather evidence before or during containment.
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.
✗
Delete the bucket and recreate it.
Why it's wrong here
Destructive, not containment.
✗
Enable MFA Delete on the bucket.
Why it's wrong here
Does not stop existing access.
✓
Enable CloudTrail data events for the bucket to log all object-level operations.
Why this is correct
Provides visibility for investigation.
Related concept
Read the scenario before looking for a memorised answer.
✓
Apply a bucket policy that denies all principals access to the bucket.
Why this is correct
Denies all access, containing the breach.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable default encryption for the bucket.
Why it's wrong here
Does not affect access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing detective controls (logging) with containment actions, and thinking that enabling encryption or MFA Delete will stop an active compromise, when they only protect against future risks or specific deletion scenarios.
Detailed technical explanation
How to think about this question
CloudTrail data events capture S3 object-level API calls at the bucket or object ARN level, and are delivered to a CloudTrail trail or event data store. In an incident response scenario, these logs are indispensable for reconstructing the timeline of events, identifying the IAM user or role used, and determining which objects were accessed. A bucket policy that denies all principals (Option D) is a direct containment action because it immediately revokes all access to the bucket, stopping any ongoing unauthorized activity, but must be applied carefully to avoid locking out legitimate responders.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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: Enable CloudTrail data events for the bucket to log all object-level operations. — Enabling CloudTrail data events for the S3 bucket (Option C) is a critical detective control that logs all object-level operations (e.g., GetObject, PutObject, DeleteObject). This allows the security engineer to perform forensic analysis, identify the scope of the compromise, and understand the attacker's actions, which is essential for containment and remediation. While not a direct containment action, it is a necessary step to gather evidence before or during containment.
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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