The correct answer is that the upload is denied because the request does not meet the condition. This outcome occurs because the S3 bucket policy explicitly allows s3:* actions only when the s3:x-amz-server-side-encryption header is set to aws:kms, meaning any upload without that header fails the condition and triggers an implicit deny. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of how to enforce SSE-KMS encryption for S3 uploads using bucket policy, a common security control that overrides default encryption settings. A frequent trap is assuming default bucket encryption will automatically apply, but the policy condition evaluates the request headers at upload time, not the bucket’s default settings. Memory tip: think of the policy as a bouncer checking for a specific ID (the aws:kms header) — if you don’t show it at the door, you don’t get in.
SOA-C02 Security and Compliance Practice Question
This SOA-C02 practice question tests your understanding of security and compliance. 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. A SysOps administrator applies this S3 bucket policy to a bucket named 'my-bucket'. The root user of account 123456789012 attempts to upload an object to the bucket without specifying 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 is denied because the request does not meet the condition.
Option A is correct because the policy allows s3:* only when the condition s3:x-amz-server-side-encryption equals aws:kms. Since the upload does not specify encryption, the condition is not met, so the request is denied (implicit deny). Option B is wrong because default encryption would not apply if the request does not include the header. Option C is wrong because the condition explicitly requires aws:kms. Option D is wrong because the policy does not deny; it allows conditionally.
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 root user has full access.
Why it's wrong here
The policy is conditional; even root must meet conditions.
✓
The upload is denied because the request does not meet the condition.
Why this is correct
The condition requires the encryption header to be set to aws:kms.
Related concept
Standard ACLs match source addresses.
✗
The upload succeeds because the bucket has default encryption enabled.
Why it's wrong here
The policy does not consider default encryption; it requires the header.
✗
The upload is denied because the policy explicitly denies all actions.
Why it's wrong here
The policy allows conditionally; it does not explicitly deny.
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 is denied because the request does not meet the condition. — Option A is correct because the policy allows s3:* only when the condition s3:x-amz-server-side-encryption equals aws:kms. Since the upload does not specify encryption, the condition is not met, so the request is denied (implicit deny). Option B is wrong because default encryption would not apply if the request does not include the header. Option C is wrong because the condition explicitly requires aws:kms. Option D is wrong because the policy does not deny; it allows conditionally.
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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