SCS-C02 Threat Detection and Incident Response Practice Question
This SCS-C02 practice question tests your understanding of threat detection and incident response. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Refer to the exhibit. A security engineer reviews this CloudFormation template. The bucket is intended to be private. What is the security issue in the configuration?
The PublicAccessBlock configuration is missing the BlockPublicPolicy setting.
Correct. Missing BlockPublicPolicy allows a public bucket policy to be applied, making the bucket public. Enabling BlockPublicPolicy would block the policy and keep the bucket private.
B
The bucket does not have versioning enabled.
Why wrong: Incorrect. While versioning is a best practice, its absence is not the security issue here. The bucket is intended to be private, and versioning does not affect public access.
C
The bucket policy grants public read access to the bucket, which overrides the PublicAccessBlock configuration.
Why wrong: Incorrect. The bucket policy does grant public read access, but the statement that it overrides PublicAccessBlock is false. In S3, PublicAccessBlock settings are evaluated first and can block public policies if BlockPublicPolicy is enabled. The issue is that BlockPublicPolicy is missing, allowing the policy to take effect.
D
The bucket policy uses an incorrect resource ARN.
Why wrong: Incorrect. The resource ARN may be correct; the security issue is the missing BlockPublicPolicy.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The PublicAccessBlock configuration is missing the BlockPublicPolicy setting.
Option A is correct because the PublicAccessBlock configuration in the template is missing the BlockPublicPolicy setting. Without BlockPublicPolicy enabled, a bucket policy that grants public read access (Effect: Allow, Principal: *, Action: s3:GetObject) can be applied to the bucket, overriding the intended private configuration. The other PublicAccessBlock settings (BlockPublicAcls, IgnorePublicAcls, RestrictPublicBuckets) do not block bucket policies; only BlockPublicPolicy does. The security issue is that the bucket policy, though present, would be blocked if BlockPublicPolicy were enabled, but since it is missing, the bucket becomes publicly accessible.
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.
✓
The PublicAccessBlock configuration is missing the BlockPublicPolicy setting.
Why this is correct
Correct. Missing BlockPublicPolicy allows a public bucket policy to be applied, making the bucket public. Enabling BlockPublicPolicy would block the policy and keep the bucket private.
Related concept
Read the scenario before looking for a memorised answer.
✗
The bucket does not have versioning enabled.
Why it's wrong here
Incorrect. While versioning is a best practice, its absence is not the security issue here. The bucket is intended to be private, and versioning does not affect public access.
✗
The bucket policy grants public read access to the bucket, which overrides the PublicAccessBlock configuration.
Why it's wrong here
Incorrect. The bucket policy does grant public read access, but the statement that it overrides PublicAccessBlock is false. In S3, PublicAccessBlock settings are evaluated first and can block public policies if BlockPublicPolicy is enabled. The issue is that BlockPublicPolicy is missing, allowing the policy to take effect.
✗
The bucket policy uses an incorrect resource ARN.
Why it's wrong here
Incorrect. The resource ARN may be correct; the security issue is the missing BlockPublicPolicy.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap is that candidates assume any PublicAccessBlock setting prevents public access, but BlockPublicPolicy specifically blocks bucket policies. Without it, a bucket policy granting public access can be applied, making the bucket public despite other PublicAccessBlock settings.
Detailed technical explanation
How to think about this question
The PublicAccessBlock settings are evaluated at the bucket level and can block new public policies or ACLs, but they do not automatically remove or override existing bucket policies that grant public access; the policy is applied first, and the block settings only prevent future modifications that would make the bucket public. In this template, the bucket policy is created in the same stack, so the policy is applied after the PublicAccessBlock is set, but the block settings do not retroactively invalidate the policy—they only block new public policies from being added later. A real-world scenario is a misconfigured CI/CD pipeline that deploys a bucket policy granting public access alongside PublicAccessBlock, leading to unintended exposure because the block settings do not reject the policy during stack 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 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.
Quick reference
AWS S3 Storage Class Comparison
Storage Class
Min Duration
Retrieval
Use Case
S3 Standard
None
Immediate
Frequently accessed data
S3 Standard-IA
30 days
Immediate
Infrequent access, rapid retrieval
S3 One Zone-IA
30 days
Immediate
Non-critical infrequent data
S3 Intelligent-Tiering
None
Immediate–hours
Unknown or changing access patterns
S3 Glacier Instant
90 days
Milliseconds
Archive with instant retrieval
S3 Glacier Flexible
90 days
Minutes–hours
Archive, flexible retrieval
S3 Glacier Deep Archive
180 days
Hours
Long-term compliance archive
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: The PublicAccessBlock configuration is missing the BlockPublicPolicy setting. — Option A is correct because the PublicAccessBlock configuration in the template is missing the BlockPublicPolicy setting. Without BlockPublicPolicy enabled, a bucket policy that grants public read access (Effect: Allow, Principal: *, Action: s3:GetObject) can be applied to the bucket, overriding the intended private configuration. The other PublicAccessBlock settings (BlockPublicAcls, IgnorePublicAcls, RestrictPublicBuckets) do not block bucket policies; only BlockPublicPolicy does. The security issue is that the bucket policy, though present, would be blocked if BlockPublicPolicy were enabled, but since it is missing, the bucket becomes publicly accessible.
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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