The answer is that CloudTrail event history only retains events for 90 days, so older API calls are simply no longer visible there. This is because the CloudTrail event history is a free, rolling view of the last 90 days of management events, designed for quick, recent lookups, while the underlying trail itself continues to deliver logs to an S3 bucket for long-term storage. On the AWS Certified Security Specialty SCS-C02 exam, this question tests your understanding of the distinction between the CloudTrail event history (a temporary, queryable console feature) and the actual trail logs (persistent in S3). A common trap is assuming that if a trail is still active, all its events must appear in the event history—but the history is not a complete archive. Remember the 90-day wall: if you need to investigate older API calls, you must query the S3 bucket directly, often using Athena or Amazon S3 Select. A helpful memory tip is “History is a 90-day highlight reel, not the full archive.”
SCS-C02 Security Logging and Monitoring Practice Question
This SCS-C02 practice question tests your understanding of security logging and monitoring. 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 company uses AWS CloudTrail to log management events in all regions. The security team notices that some API calls made by an IAM user are not appearing in the CloudTrail event history. What is the most likely reason?
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
✓
CloudTrail event history only retains events for 90 days; older events are not visible
D is correct because CloudTrail event history only retains the last 90 days of events. If the API calls were made more than 90 days ago, they would no longer appear in the event history, even though the trail itself may still be delivering log files to an S3 bucket for longer-term storage. The security team is likely looking at the event history rather than querying the S3 bucket or using Athena for older events.
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 user used the AWS Management Console, not the CLI
Why it's wrong here
Console actions are logged via CloudTrail.
✗
The trail is configured for a single region only
Why it's wrong here
Multi-region trails are common but not required.
✗
The API calls were read-only and excluded by default
Why it's wrong here
Read events are included by default.
✓
CloudTrail event history only retains events for 90 days; older events are not visible
Why this is correct
CloudTrail event history is limited to 90 days.
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
The trap here is that candidates often assume missing API calls are due to configuration issues (like single-region trails or console-only access) rather than the 90-day retention limit of the event history, which is a fundamental but easily overlooked CloudTrail behavior.
Detailed technical explanation
How to think about this question
CloudTrail event history provides a viewable, queryable list of the most recent 90 days of management events, but it is not a permanent store. For long-term retention and analysis, logs are delivered to an S3 bucket, where they can be queried using services like Amazon Athena or AWS Lake Formation. A common real-world scenario is that security teams rely on the event history for quick investigations but miss older events that are still available in S3, leading to the mistaken belief that the calls were never logged.
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.
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: CloudTrail event history only retains events for 90 days; older events are not visible — D is correct because CloudTrail event history only retains the last 90 days of events. If the API calls were made more than 90 days ago, they would no longer appear in the event history, even though the trail itself may still be delivering log files to an S3 bucket for longer-term storage. The security team is likely looking at the event history rather than querying the S3 bucket or using Athena for older events.
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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