The most likely cause is that MFA Delete is enabled on the bucket, and S3 server access logs do not capture MFA-protected delete requests. When MFA Delete is turned on, every delete operation requires an additional authentication factor, and the S3 logging service cannot record the request because the MFA token is sent as part of the request header rather than as a standard API parameter. This is a common trap on the AWS Certified SysOps Administrator Associate SOA-C02 exam, where candidates often assume all actions are logged or confuse S3 server access logs with CloudTrail. The key distinction is that CloudTrail captures MFA Delete API calls, but S3 access logs skip them entirely. Remember the memory tip: "MFA hides deletes from S3 logs, but CloudTrail still sees the key."
SOA-C02 Security and Compliance Practice Question
This SOA-C02 practice question tests your understanding of security and compliance. 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 company has an S3 bucket configured to log all access requests to another bucket. The security team notices that some delete requests are not being logged. What is the most likely cause?
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 bucket has MFA Delete enabled, and the logging configuration does not capture MFA delete requests
S3 server access logs capture all requests that are made to a bucket, including delete requests. However, if the requester uses AWS Systems Manager or AWS CloudTrail to perform the deletion, it might not appear in S3 access logs if the logging bucket has a lifecycle policy that deletes logs before they are reviewed. But the most common reason for missing delete logs is that the requester used the S3 console with Multi-Factor Authentication (MFA) delete enabled, which requires additional authentication and might not be logged if the logging bucket itself has a policy that denies logging of MFA delete requests. However, the question asks for the most likely cause. Option C is correct because if MFA delete is enabled on the bucket, delete requests require MFA, and S3 server access logs might not capture these requests if the logging configuration does not support it. Option A is wrong because AWS CloudTrail logs API calls, including delete requests, but they would be in CloudTrail, not missing from S3 logs. Option B is wrong because S3 server access logs do capture delete requests. Option D is wrong because bucket policies do not prevent logging; they might deny access but the request would still be logged if denied.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 delete requests were made through AWS CloudTrail, which bypasses S3 access logging
Why it's wrong here
CloudTrail logs are separate, but S3 access logs still capture the request.
✗
The bucket policy denies logging of delete requests
Why it's wrong here
Bucket policies do not affect logging; they affect access.
✓
The bucket has MFA Delete enabled, and the logging configuration does not capture MFA delete requests
Why this is correct
MFA Delete requests may not be logged by S3 server access logs if the logging configuration is not set up to capture them.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
S3 server access logs do not capture DELETE requests
Why it's wrong here
S3 access logs capture all request types including DELETE.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SOA-C02 ACL questions on filtering logic and placement.
Security and Compliance — This question tests Security and Compliance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The bucket has MFA Delete enabled, and the logging configuration does not capture MFA delete requests — S3 server access logs capture all requests that are made to a bucket, including delete requests. However, if the requester uses AWS Systems Manager or AWS CloudTrail to perform the deletion, it might not appear in S3 access logs if the logging bucket has a lifecycle policy that deletes logs before they are reviewed. But the most common reason for missing delete logs is that the requester used the S3 console with Multi-Factor Authentication (MFA) delete enabled, which requires additional authentication and might not be logged if the logging bucket itself has a policy that denies logging of MFA delete requests. However, the question asks for the most likely cause. Option C is correct because if MFA delete is enabled on the bucket, delete requests require MFA, and S3 server access logs might not capture these requests if the logging configuration does not support it. Option A is wrong because AWS CloudTrail logs API calls, including delete requests, but they would be in CloudTrail, not missing from S3 logs. Option B is wrong because S3 server access logs do capture delete requests. Option D is wrong because bucket policies do not prevent logging; they might deny access but the request would still be logged if denied.
What should I do if I get this SOA-C02 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SOA-C02 ACL questions on filtering logic and placement.
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?
Standard ACLs match source addresses.
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