The answer is that the upload fails because the Deny statement blocks any PutObject request that does not specify AES256 encryption. This occurs because the IAM policy includes a Deny statement with the condition `StringNotEquals` on `s3:x-amz-server-side-encryption`, which matches when the header is absent or set to any value other than AES256. Since IAM Deny statements override Allow statements, the request is immediately denied. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of how IAM policy evaluation logic works, particularly the precedence of explicit Deny over Allow and how condition keys like `s3:x-amz-server-side-encryption` are evaluated when the header is missing. A common trap is assuming that an Allow statement with a condition will implicitly deny requests that don’t meet the condition, but in reality, an Allow only grants permission when the condition is true; without an explicit Deny, the request would be implicitly allowed. Remember the memory tip: “Deny always wins, and missing headers fail the condition.”
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.
A solutions architect applies the IAM policy shown in the exhibit to an IAM user. The user attempts to upload an object to the S3 bucket 'my-bucket' without specifying the 'x-amz-server-side-encryption' header. 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 blocks any PutObject request that does not specify AES256 encryption.
Option B is correct. The Deny statement with StringNotEquals will match because the condition s3:x-amz-server-side-encryption is not set (or evaluates to a value not equal to AES256). Since the Deny statement applies, the request is denied. Option A is wrong because the Allow statement requires the condition to be true; if not specified, the condition is not met. Option C is wrong because the Deny statement explicitly denies if encryption is not AES256. Option D is wrong because the condition is evaluated.
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 succeeds because the Allow statement grants the s3:PutObject permission.
Why it's wrong here
The Allow statement has a condition that is not satisfied, so it does not grant permission.
✗
The upload succeeds because the Deny statement only applies when the header is present but set to a value other than AES256.
Why it's wrong here
The Deny applies when the header is not equal to AES256; missing header is not equal.
✓
The upload fails because the Deny statement blocks any PutObject request that does not specify AES256 encryption.
Why this is correct
The Deny statement with StringNotEquals denies if encryption header is not present or not AES256.
Related concept
Standard ACLs match source addresses.
✗
The upload fails because the condition is malformed and causes an error.
Why it's wrong here
The condition is valid; it uses StringNotEquals correctly.
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 blocks any PutObject request that does not specify AES256 encryption. — Option B is correct. The Deny statement with StringNotEquals will match because the condition s3:x-amz-server-side-encryption is not set (or evaluates to a value not equal to AES256). Since the Deny statement applies, the request is denied. Option A is wrong because the Allow statement requires the condition to be true; if not specified, the condition is not met. Option C is wrong because the Deny statement explicitly denies if encryption is not AES256. Option D is wrong because the condition is evaluated.
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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