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Development with AWS Services →hardMultiple ChoiceObjective-mapped

DVA-C02 Development with AWS Services Practice Question

This DVA-C02 practice question tests your understanding of development with aws services. 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.

Exhibit

Refer to the exhibit.

CloudFormation snippet:
Resources:
  MyBucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: !Sub "${AWS::StackName}-bucket"
      VersioningConfiguration:
        Status: Enabled
      LifecycleConfiguration:
        Rules:
          - Id: ExpireOldVersions
            Status: Enabled
            NoncurrentVersionExpirationInDays: 30
  MyQueue:
    Type: AWS::SQS::Queue
    Properties:
      QueueName: !Sub "${AWS::StackName}-queue"
  MyBucketPolicy:
    Type: AWS::S3::BucketPolicy
    Properties:
      Bucket: !Ref MyBucket
      PolicyDocument:
        Statement:
          - Effect: Allow
            Principal: "*"
            Action: "s3:PutObject"
            Resource: !Sub "${MyBucket.Arn}/*"
            Condition:
              StringEquals:
                s3:x-amz-server-side-encryption: "aws:kms"

Refer to the exhibit. A developer creates a CloudFormation stack with this template. The developer wants to ensure that all objects uploaded to the bucket are encrypted at rest using SSE-KMS. However, the current policy allows anyone to put objects without encryption. What additional change is needed to enforce SSE-KMS?

Question 1hardmultiple choice
Full question →

Exhibit

Refer to the exhibit.

CloudFormation snippet:
Resources:
  MyBucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: !Sub "${AWS::StackName}-bucket"
      VersioningConfiguration:
        Status: Enabled
      LifecycleConfiguration:
        Rules:
          - Id: ExpireOldVersions
            Status: Enabled
            NoncurrentVersionExpirationInDays: 30
  MyQueue:
    Type: AWS::SQS::Queue
    Properties:
      QueueName: !Sub "${AWS::StackName}-queue"
  MyBucketPolicy:
    Type: AWS::S3::BucketPolicy
    Properties:
      Bucket: !Ref MyBucket
      PolicyDocument:
        Statement:
          - Effect: Allow
            Principal: "*"
            Action: "s3:PutObject"
            Resource: !Sub "${MyBucket.Arn}/*"
            Condition:
              StringEquals:
                s3:x-amz-server-side-encryption: "aws:kms"

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

✓

Set the bucket's default encryption configuration to SSE-KMS.

Option B is correct because the policy condition only checks for the header, but if the user does not specify it, the request is denied. However, the bucket policy should also deny PutObject if the header is not present, which is already done via the condition. But the issue is that the bucket does not have a default encryption setting. Option A is wrong because the condition already requires the header. Option C is wrong because the condition is already correct. Option D is wrong because bucket policy already exists.

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.

  • ✓

    Set the bucket's default encryption configuration to SSE-KMS.

    Why this is correct

    Default encryption ensures encryption even if not specified in request.

    Related concept

    Standard ACLs match source addresses.

  • ✗

    Add a bucket policy that denies PutObject if encryption is not set.

    Why it's wrong here

    The condition already does that; need default encryption.

  • ✗

    Modify the condition to use s3:x-amz-server-side-encryption-aws-kms-key-id.

    Why it's wrong here

    That is for specific key ID, not necessary.

  • ✗

    Remove the condition to allow all PutObject requests.

    Why it's wrong here

    Would disable encryption enforcement.

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 DVA-C02 ACL questions on filtering logic and placement.

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FAQ

Questions learners often ask

What does this DVA-C02 question test?

Development with AWS Services — This question tests Development with AWS Services — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: Set the bucket's default encryption configuration to SSE-KMS. — Option B is correct because the policy condition only checks for the header, but if the user does not specify it, the request is denied. However, the bucket policy should also deny PutObject if the header is not present, which is already done via the condition. But the issue is that the bucket does not have a default encryption setting. Option A is wrong because the condition already requires the header. Option C is wrong because the condition is already correct. Option D is wrong because bucket policy already exists.

What should I do if I get this DVA-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 DVA-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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Last reviewed: Jun 20, 2026

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This DVA-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DVA-C02 exam.