The answer is that the upload fails because the Deny statement explicitly denies PutObject when the encryption is not aws:kms. This occurs because the condition "StringNotEquals" in the Deny block evaluates to true when SSE-S3 (AES256) is used, since AES256 does not equal aws:kms, triggering the explicit deny which overrides any Allow statement. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of IAM policy evaluation logic, specifically that an explicit Deny always takes precedence over an Allow, and that conditions in Deny statements can block actions even if the service supports the encryption method. A common trap is assuming that an Allow for GetObject or a general PutObject permission will bypass a Deny, but the key is that the Deny’s condition matches the non-KMS encryption. Memory tip: "Deny with a condition is a lock—if the key doesn't match, the door stays shut."
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. 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.
Refer to the exhibit. An IAM policy is attached to a user. The user attempts to upload an object to example-bucket with SSE-S3 (AES256) encryption. What will happen?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The upload fails because the Deny statement explicitly denies it
Option D is correct. The Deny statement explicitly denies PutObject if the encryption is NOT aws:kms. Since the user uses SSE-S3 (AES256), the condition 'StringNotEquals' evaluates to true (AES256 != aws:kms), so the Deny applies and the request is denied. Option A is wrong because the Allow statement is for GetObject, not PutObject. Option B is wrong because the Deny overrides any allow. Option C is wrong because the Deny explicitly denies.
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 upload fails because the Deny statement explicitly denies it
Why this is correct
Deny condition matches when encryption is not aws:kms.
Related concept
Standard ACLs match source addresses.
✗
The upload fails because there is no explicit Allow for PutObject
Why it's wrong here
Implicit deny is not the primary reason; explicit deny applies.
✗
The upload succeeds because the Allow statement permits it
Why it's wrong here
Allow is for GetObject, not PutObject.
✗
The upload succeeds because SSE-S3 is allowed by the first statement
Why it's wrong here
First statement is for GetObject only.
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 SAP-C02 ACL questions on filtering logic and placement.
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The upload fails because the Deny statement explicitly denies it — Option D is correct. The Deny statement explicitly denies PutObject if the encryption is NOT aws:kms. Since the user uses SSE-S3 (AES256), the condition 'StringNotEquals' evaluates to true (AES256 != aws:kms), so the Deny applies and the request is denied. Option A is wrong because the Allow statement is for GetObject, not PutObject. Option B is wrong because the Deny overrides any allow. Option C is wrong because the Deny explicitly denies.
What should I do if I get this SAP-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 SAP-C02 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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