← DOP-C02·Amazon Web Services

Question 370 of 1,740

Security and Compliance →easyMultiple ChoiceObjective-mapped

Quick Answer

The correct answer is the bucket policy that denies s3:PutObject unless the request includes the specific KMS key ID in the s3:x-amz-server-side-encryption-aws-kms-key-id condition key. This works because SSE-KMS encryption enforcement requires checking that the encryption key matches your designated KMS key, not just that encryption is present; by using a Deny effect with StringNotEquals, any PutObject attempt that does not specify the exact key ID is blocked. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your ability to distinguish between SSE-S3 and SSE-KMS policy conditions—a common trap is confusing the s3:x-amz-server-side-encryption condition (which checks for AES256) with the KMS-specific key ID condition. Remember the memory tip: "Deny the wrong key, not just the wrong algorithm" to avoid picking the AES256-based policy.

DOP-C02 Security and Compliance Practice Question

This DOP-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.

A company wants to encrypt data at rest in Amazon S3 using server-side encryption with AWS Key Management Service (SSE-KMS) and enforce that all new objects are encrypted. Which bucket policy statement should be added?

Question 1easymultiple choice

Full question →

A
{"Effect":"Deny","Action":"s3:PutObject","Resource":"arn:aws:s3:::bucket/*","Condition":{"StringNotEquals":{"s3:ServerSideEncryption":"awskms"}}}
Why wrong: Not a valid condition key for server-side encryption.
B
{"Effect":"Deny","Action":"s3:PutObject","Resource":"arn:aws:s3:::bucket/*","Condition":{"StringNotEquals":{"s3:x-amz-server-side-encryption-aws-kms-key-id":"arn:aws:kms:us-east-1:123456789012:key/1234-5678-9012"}}}
Why wrong: The condition key is misspelled; should be s3:x-amz-server-side-encryption-aws-kms-key-id.
C
{"Effect":"Deny","Action":"s3:PutObject","Resource":"arn:aws:s3:::bucket/*","Condition":{"StringNotEquals":{"s3:x-amz-server-side-encryption-aws-kms-key-id":"arn:aws:kms:us-east-1:123456789012:key/1234-5678-9012"}}}
Correctly denies PutObject if the KMS key ID does not match.
D
{"Effect":"Deny","Action":"s3:PutObject","Resource":"arn:aws:s3:::bucket/*","Condition":{"StringNotEquals":{"s3:x-amz-server-side-encryption":"AES256"}}}
Why wrong: This enforces SSE-S3, not SSE-KMS.

Full breakdown with real-world context →

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

{"Effect":"Deny","Action":"s3:PutObject","Resource":"arn:aws:s3:::bucket/*","Condition":{"StringNotEquals":{"s3:x-amz-server-side-encryption-aws-kms-key-id":"arn:aws:kms:us-east-1:123456789012:key/1234-5678-9012"}}}

Option A is correct because it denies s3:PutObject if the encryption key is not the specified KMS key. Option B is wrong because it denies PutObject if encryption is not AES256, which enforces SSE-S3, not SSE-KMS. Option C is wrong because the condition key s3:x-amz-server-side-encryption-aws-kms-key-id is not valid. Option D is wrong because the condition key s3:ServerSideEncryption is not a valid condition key.

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.

✗
{"Effect":"Deny","Action":"s3:PutObject","Resource":"arn:aws:s3:::bucket/*","Condition":{"StringNotEquals":{"s3:ServerSideEncryption":"awskms"}}}
Why it's wrong here
Not a valid condition key for server-side encryption.
✗
{"Effect":"Deny","Action":"s3:PutObject","Resource":"arn:aws:s3:::bucket/*","Condition":{"StringNotEquals":{"s3:x-amz-server-side-encryption-aws-kms-key-id":"arn:aws:kms:us-east-1:123456789012:key/1234-5678-9012"}}}
Why it's wrong here
The condition key is misspelled; should be s3:x-amz-server-side-encryption-aws-kms-key-id.
✓
{"Effect":"Deny","Action":"s3:PutObject","Resource":"arn:aws:s3:::bucket/*","Condition":{"StringNotEquals":{"s3:x-amz-server-side-encryption-aws-kms-key-id":"arn:aws:kms:us-east-1:123456789012:key/1234-5678-9012"}}}
Why this is correct
Correctly denies PutObject if the KMS key ID does not match.
Related concept
Standard ACLs match source addresses.
✗
{"Effect":"Deny","Action":"s3:PutObject","Resource":"arn:aws:s3:::bucket/*","Condition":{"StringNotEquals":{"s3:x-amz-server-side-encryption":"AES256"}}}
Why it's wrong here
This enforces SSE-S3, not SSE-KMS.

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 DOP-C02 ACL questions on filtering logic and placement.

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FAQ

Questions learners often ask

What does this DOP-C02 question test?

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: {"Effect":"Deny","Action":"s3:PutObject","Resource":"arn:aws:s3:::bucket/*","Condition":{"StringNotEquals":{"s3:x-amz-server-side-encryption-aws-kms-key-id":"arn:aws:kms:us-east-1:123456789012:key/1234-5678-9012"}}} — Option A is correct because it denies s3:PutObject if the encryption key is not the specified KMS key. Option B is wrong because it denies PutObject if encryption is not AES256, which enforces SSE-S3, not SSE-KMS. Option C is wrong because the condition key s3:x-amz-server-side-encryption-aws-kms-key-id is not valid. Option D is wrong because the condition key s3:ServerSideEncryption is not a valid condition key.

What should I do if I get this DOP-C02 question wrong?

What is the key concept behind this question?

Standard ACLs match source addresses.

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