SCS-C02 Threat Detection and Incident Response Practice Question
This SCS-C02 practice question tests your understanding of threat detection and incident response. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 financial services company uses AWS Organizations with over 100 accounts. The security team uses AWS CloudTrail to log all API calls to a central S3 bucket in the security account. The bucket policy enables cross-account log delivery from all member accounts. The team notices that some API calls from a specific member account are not appearing in the central bucket. The CloudTrail trail in that member account is configured to deliver logs to the central bucket. The IAM role used by CloudTrail in the member account has permissions to write to the central bucket. The security team has verified that the bucket policy allows the member account to write. What is the MOST likely cause of the missing logs?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The S3 bucket policy in the central bucket exceeds the size limit, causing write failures for some accounts.
The S3 bucket policy has a maximum size limit of 20,480 characters. When a bucket policy exceeds this limit, AWS may reject new or updated policy statements, causing write failures for some accounts. In this scenario, with over 100 accounts, the bucket policy likely grew too large, preventing CloudTrail from the specific member account from writing logs to the central bucket, even though the trail and IAM role are correctly configured.
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 S3 bucket policy in the central bucket exceeds the size limit, causing write failures for some accounts.
Why this is correct
Bucket policies have a 20 KB limit; exceeding it can cause intermittent failures.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The CloudTrail trail in the member account is not a multi-region trail.
Why it's wrong here
Missing logs could be from any region, but the question implies some logs are missing overall.
✗
The member account has not enabled CloudTrail logging for the specific region.
Why it's wrong here
The trail is configured, so logging should work.
✗
A service control policy (SCP) is denying the CloudTrail service in the member account from writing to the central bucket.
Why it's wrong here
SCP would affect all accounts, not just one.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often overlook the S3 bucket policy size limit and instead focus on trail configuration or SCPs, assuming missing logs are due to misconfigured trails or permission denials, rather than a resource limit on the policy itself.
Detailed technical explanation
How to think about this question
AWS S3 bucket policies are subject to a 20,480 character limit, and when exceeded, AWS may silently reject updates or cause partial enforcement, leading to intermittent write failures for specific principals. In large AWS Organizations setups, administrators often add individual account ARNs or organization IDs to the bucket policy, which can quickly consume the character limit. A real-world scenario involves using AWS CloudTrail with organization trails, which automatically aggregate logs from all accounts without needing per-account bucket policy entries, avoiding this limit issue.
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: The S3 bucket policy in the central bucket exceeds the size limit, causing write failures for some accounts. — The S3 bucket policy has a maximum size limit of 20,480 characters. When a bucket policy exceeds this limit, AWS may reject new or updated policy statements, causing write failures for some accounts. In this scenario, with over 100 accounts, the bucket policy likely grew too large, preventing CloudTrail from the specific member account from writing logs to the central bucket, even though the trail and IAM role are correctly configured.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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