Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
A company has multiple AWS accounts managed under AWS Organizations. The security team requires that all Amazon S3 buckets with bucket names containing 'logs' must be encrypted with a specific KMS key (key ID: alias/logs-key) at rest. A developer must enforce this using an SCP (Service Control Policy). Which SCP effect and condition key should be used to deny any PutObject request that does not use the required KMS key?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
Deny effect with a Condition: StringNotEquals on s3:x-amz-server-side-encryption-aws-kms-key-id
This SCP will deny any PutObject request that specifies a KMS key that is not the required key. The StringNotEquals condition ensures that if the request does not use the specific key ID, the request is denied. This is the standard way to enforce encryption with a specific KMS key using SCPs.
B
Distractor review
Deny effect with a Condition: StringEquals on s3:x-amz-server-side-encryption
The condition key s3:x-amz-server-side-encryption only checks whether encryption is requested (e.g., AES256 or aws:kms), but does not specify which KMS key. Using StringEquals with this key would deny requests that do not use the encryption header, but it would not enforce the use of a specific KMS key.
C
Distractor review
Allow effect with a Condition: StringEquals on kms:RequestTag/key-id
SCPs cannot use Allow effect to explicitly allow actions; they are used to deny. Also, kms:RequestTag/key-id is not a valid condition key for S3 PutObject. This approach is incorrect and insecure.
D
Distractor review
Deny effect with a Condition: IpAddress on aws:SourceIp
This condition restricts access based on IP address, not encryption. It does not enforce the use of a specific KMS key and is irrelevant to the requirement.
Common exam trap
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.
Technical deep dive
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.
Related practice questions
Related DVA-C02 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A developer is building a REST API using Amazon API Gateway that will serve static content from an Amazon S3 bucket. The API should cache responses for frequently accessed objects to reduce latency. Which API Gateway feature should the developer enable?
Question 2
A developer is running a web application on multiple Amazon EC2 instances behind an Application Load Balancer (ALB). The application needs to store user session state that must be available across all instances. The session data is small and temporary but must survive individual instance failures. Which AWS service should the developer use to store this session state?
Question 3
A developer has an AWS Lambda function that processes messages from an Amazon SQS standard queue. The function is idempotent and currently has a batch size of 10. The developer wants to increase throughput and increases the batch size to 100. After the change, CloudWatch metrics show a significant increase in throttles and the queue backlog is growing. The function's reserved concurrency is set to 10. What is the most effective action to resolve the throttling and improve throughput?
Question 4
A developer is managing an application running on Amazon EC2 instances behind an Application Load Balancer. Users report that the application becomes unresponsive after several hours, and restarting the instance temporarily fixes the issue. The developer suspects a memory leak but cannot add custom instrumentation. Which AWS service can collect memory utilization metrics and help identify the memory leak with minimal configuration?
Question 5
A developer is building a serverless web application using AWS Lambda and Amazon DynamoDB. The application needs to perform complex aggregations on data stored in DynamoDB. Which AWS service should the developer use to perform these aggregations efficiently without reading all the data into Lambda?
Question 6
A developer has an Amazon S3 bucket containing private user documents. The application must generate a time-limited URL for users to download their own documents without requiring the users to have AWS credentials. Which solution should the developer use?
FAQ
Questions learners often ask
What does this DVA-C02 question test?
Standard ACLs match source addresses.
What is the correct answer to this question?
The correct answer is: Deny effect with a Condition: StringNotEquals on s3:x-amz-server-side-encryption-aws-kms-key-id — Service Control Policies (SCPs) can enforce conditions on API calls. To deny PutObject requests that do not use the specified KMS key, the SCP should have a Deny effect with a condition that matches requests where the encryption key is not the required key. The condition key s3:x-amz-server-side-encryption-aws-kms-key-id is used to check the KMS key ID. The condition should be a StringNotEquals to deny if the key ID does not match.
What should I do if I get this DVA-C02 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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