The correct answer is that the upload fails because the Deny statement denies PutObject without encryption. This outcome hinges on how AWS Identity and Access Management (IAM) policy evaluation logic works: any explicit Deny always overrides any Allow, and the condition in the Deny statement checks whether the `x-amz-server-side-encryption` header equals `aws:kms`. Since the AdminRole’s upload request lacks this header entirely, the condition is not met, so the Deny applies and blocks the action. The Allow statement, which grants PutObject only when encryption is `aws:kms`, does not apply because the request fails that condition. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of enforcing server-side encryption on S3 uploads with bucket policies, a common security requirement. A frequent trap is assuming an Allow without conditions will override a Deny, but remember: Deny always wins. Memory tip: “No header, no entry—Deny blocks without the encryption key.”
SOA-C02 Security and Compliance Practice Question
This SOA-C02 practice question tests your understanding of security and compliance. 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.
An S3 bucket policy is shown in the exhibit. The AdminRole attempts to upload an object to my-bucket without specifying any 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 denies PutObject without encryption.
Option C is correct. The Deny statement denies PutObject when encryption is not aws:kms. Since the request has no encryption header, it does not equal aws:kms, so the Deny applies and the upload fails. The Allow statement allows the action only when encryption is aws:kms, so without encryption, it does not apply. Because the Deny overrides Allow, the upload is denied. Option A is wrong because the Allow does not apply. Option B is wrong because the Deny applies. Option D is wrong because the Deny does not depend on the Allow.
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 Allow statement requires encryption, but the Deny statement is evaluated first.
Why it's wrong here
While the result is failure, the reason is the Deny statement, not the Allow statement requiring encryption.
✗
The upload succeeds because the Allow statement grants permission to the AdminRole.
Why it's wrong here
The Allow statement requires encryption header aws:kms, which is not present.
✗
The upload succeeds because the Deny statement does not apply to the AdminRole.
Why it's wrong here
The Deny statement applies to all principals including AdminRole.
✓
The upload fails because the Deny statement denies PutObject without encryption.
Why this is correct
The Deny statement explicitly denies PutObject when encryption is not aws:kms.
Related concept
Standard ACLs match source addresses.
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 upload fails because the Deny statement denies PutObject without encryption. — Option C is correct. The Deny statement denies PutObject when encryption is not aws:kms. Since the request has no encryption header, it does not equal aws:kms, so the Deny applies and the upload fails. The Allow statement allows the action only when encryption is aws:kms, so without encryption, it does not apply. Because the Deny overrides Allow, the upload is denied. Option A is wrong because the Allow does not apply. Option B is wrong because the Deny applies. Option D is wrong because the Deny does not depend on the Allow.
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.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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