The answer is that the CloudTrail trail in each account is not associated with an SQS queue, causing delivery failures. When delivering logs from multiple accounts to a central S3 bucket, CloudTrail relies on an Amazon SQS queue in the central security account to buffer and manage the flow of log files; without this queue, intermittent delivery failures occur because CloudTrail has no mechanism to retry or queue writes under load, leading to missing logs even when the trail status shows "Logging" and the bucket policy is correct. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding of multi-account CloudTrail architecture—specifically that cross-account log delivery requires an SQS queue to handle asynchronous delivery, a detail often overlooked in favor of checking bucket policies or encryption settings. A common trap is assuming a valid bucket policy alone guarantees delivery, but the SQS queue is the critical intermediary for reliability. Memory tip: think "SQS = Saves Queued Sends" to remember it prevents log loss in multi-account setups.
SCS-C02 Security Logging and Monitoring Practice Question
This SCS-C02 practice question tests your understanding of security logging and monitoring. 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.
A company has a multi-account AWS environment with 50 accounts. The security team uses AWS CloudTrail to log management events in each account and delivers logs to a centralized S3 bucket in the security account. Recently, the team noticed that some CloudTrail logs are missing from the central bucket for a few accounts. The logs appear to be delivered intermittently. The security engineer checks the CloudTrail configuration in one of the affected accounts and sees that the trail is configured to deliver to the central bucket. The bucket policy in the security account allows CloudTrail to write from all accounts. The engineer also checks the CloudTrail console and sees that the trail status is 'Logging'. What is the MOST likely cause of the intermittent log delivery?
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 CloudTrail trail in each account is not associated with an SQS queue, causing delivery failures.
Option A is correct. CloudTrail uses SQS to deliver logs from multiple accounts to a central bucket. If the SQS queue is not configured properly or is throttled, logs may be lost. Option B is wrong because CloudTrail does not use Kinesis. Option C is wrong because S3 Lifecycle policies do not affect delivery. Option D is wrong because the issue is not about encryption.
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 has default encryption enabled, which interferes with CloudTrail writes.
Why it's wrong here
Default encryption does not interfere.
✗
The S3 bucket has a Lifecycle policy that deletes objects prematurely.
Why it's wrong here
Lifecycle policies do not affect delivery.
✗
The CloudTrail trail is using Kinesis Data Firehose for delivery, which has a throughput limit.
Why it's wrong here
CloudTrail does not use Kinesis for delivery.
✓
The CloudTrail trail in each account is not associated with an SQS queue, causing delivery failures.
Why this is correct
Cross-account delivery requires an SQS queue to buffer logs.
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 SCS-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Security Logging and Monitoring — This question tests Security Logging and Monitoring — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The CloudTrail trail in each account is not associated with an SQS queue, causing delivery failures. — Option A is correct. CloudTrail uses SQS to deliver logs from multiple accounts to a central bucket. If the SQS queue is not configured properly or is throttled, logs may be lost. Option B is wrong because CloudTrail does not use Kinesis. Option C is wrong because S3 Lifecycle policies do not affect delivery. Option D is wrong because the issue is not about encryption.
What should I do if I get this SCS-C02 question wrong?
Identify which SCS-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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