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For learners studying for AWS Certified Developer - Associate (DVA-C02)
What you'll learn
Practice pack content
Domain 1 - Development with AWS Services
Domain 2 – Security
Domain 3 – Deployment
Domain 4 – Troubleshooting and Optimization
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Try 3 Developer - Associate (DVA-C02) practice questions
Choose an answer, explore the explanation, and see why the other options are less suitable. Three short scenarios. No sign-in required.
1. Preventing duplicate payment processing
An Amazon SQS queue invokes a Lambda function that charges customers through a payment service. Occasionally the same message is processed more than once after a retry. Which application change best prevents the same transaction from being charged twice?
Answer and full explanation
Correct answer: B — Make the Lambda processing idempotent.
Why B is correct
AWS Lambda integrations can process an event more than once, so application code should tolerate duplicate delivery. Idempotent processing ensures that receiving the same transaction again does not repeat a side effect such as charging a customer twice. The function can use a unique transaction identifier and persist the processed state, for example with a DynamoDB conditional write or an idempotency utility, before allowing the charge to proceed. DVA-C02 Domain 1 includes developing Lambda code, handling event lifecycles and errors, and building resilient application behavior. AWS Lambda best practices specifically recommend idempotent code for safely handling duplicate events.
Why the other options are less suitable
- A — Reduce the visibility timeout: A shorter visibility timeout can make a message available for redelivery sooner. It does not prevent duplicate processing and can increase the chance that another worker receives an in-flight message too early.
- C — Reserved concurrency of one: Limiting concurrency changes how many invocations run simultaneously, not whether the same event can be retried later. A duplicate message can still trigger the same charge sequentially.
- D — Increase memory: More memory can improve Lambda CPU allocation and execution time for some workloads. It does not create a mechanism for recognizing that a transaction has already been processed.
Key takeaway: Design Lambda business logic to be idempotent whenever retries or duplicate event delivery could repeat a side effect.
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2. Removing database credentials from source code
A developer finds an Amazon RDS username and password hardcoded in an application's source repository. The credentials must be removed from code and rotated automatically on a schedule. Which approach best meets these requirements?
Answer and full explanation
Correct answer: C — Use AWS Secrets Manager with automatic rotation.
Why C is correct
AWS Secrets Manager is designed to store sensitive values separately from application source code and let applications retrieve them when needed. DVA-C02 Security Task 3 explicitly includes using secret-management services to secure sensitive data. Secrets Manager can automatically rotate supported database credentials on a schedule, updating the stored secret and the database or service. Moving the RDS credentials there removes the plaintext value from the repository and supports controlled access through IAM. This directly satisfies both the storage and rotation requirements.
Why the other options are less suitable
- A — Unencrypted configuration file: This still distributes the credential with the application artifact and does not provide managed rotation. Anyone who can inspect the package could potentially recover the secret.
- B — Committed environment-variable value: Environment variables can be useful for configuration, but committing the secret value to an infrastructure template still exposes it in source or deployment artifacts. It also does not provide the requested managed rotation.
- D — Public S3 object: Publicly readable credentials would create a severe security exposure. Amazon S3 storage does not turn a secret into a secure credential-management workflow simply because the application can retrieve it.
Key takeaway: Keep application secrets out of source code and use a purpose-built secret store when credentials also need controlled rotation.
3. Limiting risk during a Lambda release
A team is releasing a new Lambda version and wants to send a small percentage of production traffic to it first. If the function's error-rate alarm enters the ALARM state, the deployment should automatically return traffic to the previous version. Which approach best meets the requirement?
Answer and full explanation
Correct answer: A — Use a CodeDeploy canary deployment with an alarm-driven rollback.
Why A is correct
A CodeDeploy canary deployment can shift an initial percentage of traffic to a new Lambda version and move the remaining traffic after a defined interval. DVA-C02 Deployment Task 4 explicitly includes deployment strategies such as canary releases and application rollbacks. A CodeDeploy deployment group can monitor associated CloudWatch alarms and stop or automatically roll back when an alarm threshold is met. For Lambda, the rollback redeploys the last known good revision and redirects traffic away from the failed release. This matches both the gradual exposure and automated rollback requirements.
Why the other options are less suitable
- B — Shift all traffic immediately: An all-at-once release does not provide the requested limited initial exposure. A defect would affect the entire production workload before the team could react.
- C — S3 Lifecycle: Lifecycle policies manage object storage classes and expiration. Preserving an artifact does not control Lambda traffic shifting or trigger rollback from a CloudWatch alarm.
- D — CloudFormation drift detection: Drift detection identifies differences between deployed resources and their template definitions. It is not a deployment strategy for gradually routing Lambda traffic or rolling back based on application error rates.
Key takeaway: Canary traffic shifting plus CloudWatch alarms and CodeDeploy rollback reduces the blast radius of a Lambda release.
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Requirements
- AWS recommends one or more years of hands-on experience developing and maintaining applications with AWS services, plus proficiency in at least one high-level programming language and familiarity with application lifecycle management.
- If some objectives are unfamiliar, combine question practice with hands-on work involving Lambda, API Gateway, DynamoDB, messaging, IAM, Secrets Manager, AWS SDKs, infrastructure as code, CI/CD, CloudWatch, and application troubleshooting.
- You will need an internet-connected device, a current web browser, and an ExamsDigest account to use the online practice product; this does not imply offline availability or a separate mobile application.
Know the exam you’re studying for
These details describe AWS’s official Developer - Associate (DVA-C02) exam.
What our students say
“The DVA-C02 practice exams helped me understand the question style and showed me where I was still weak, especially around Lambda, DynamoDB, security, and deployment. The explanations made it much easier to review the topics I missed.”
Mason Callahan
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“The questions covered a good mix of development, IAM, Secrets Manager, CI/CD, monitoring, and troubleshooting. Going through the explanations after each practice session helped me understand the AWS services instead of just memorizing answers.”
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“I had already used AWS Skill Builder and other Developer Associate study resources before trying ExamsDigest. What I liked most was how clearly the explanations compared each option, especially for Lambda, API Gateway, messaging, and deployment scenarios.”
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Your questions, answered.
Which AWS Developer exam do these practice questions target?
These questions target AWS Certified Developer – Associate DVA-C02. AWS has announced an updated DVA-C03 exam, so check the code on your scheduled exam before purchasing or studying. DVA-C02 is still available as of October 3, 2026, but it is in its retirement transition period. The DVA-C02 guide and domain weights used here remain specific to that requested version.
Who is DVA-C02 practice intended for?
It is aimed at developers who build and maintain applications with AWS services. AWS recommends at least one year of hands-on AWS application-development experience, proficiency in a high-level programming language, familiarity with development tools, and understanding of application lifecycle management. The guide expects candidates to use AWS APIs, SDKs, the AWS CLI, CI/CD workflows, Lambda, data stores, security controls, and observability rather than design complete enterprise architectures.
How should I combine DVA-C02 practice with hands-on study?
Use practice questions alongside the official guide and small AWS development exercises. Work with Lambda, API Gateway, DynamoDB, SQS, SNS, EventBridge, IAM roles, Secrets Manager, AWS SDKs, AWS SAM or CloudFormation, CI/CD deployments, CloudWatch Logs, metrics, and tracing. DVA-C02 tests decisions developers make while coding, testing, deploying, securing, and debugging applications, so practical familiarity with service behavior and failure conditions is useful.
What should I do when I answer a DVA-C02 question incorrectly?
Use the explanation to identify the exact development decision you missed, then revisit the matching task in the AWS guide. Determine whether the error involved event handling, Lambda configuration, DynamoDB access, authentication, secrets, encryption, deployment strategies, testing, observability, or performance. Compare why each distractor fails the scenario instead of memorizing an answer letter. Practice results can expose learning gaps, but they should not be treated as a guaranteed prediction of your official result.
What question formats appear on the official DVA-C02 exam?
AWS uses multiple-choice and multiple-response items. The guide identifies 50 scored questions and 15 unscored questions; AWS does not identify the unscored items during the exam. The three preview examples intentionally use only single-answer questions because that is what this widget supports. They therefore do not simulate the multiple-response interaction or establish that every official format is included in the paid ExamsDigest product.
Does completing this practice earn AWS Certified Developer - Associate?
No. Completing an ExamsDigest practice product does not award the AWS Certified Developer – Associate credential or replace AWS’s official certification process. Practice access, registering for DVA-C02, sitting the official exam through AWS’s testing process, and receiving the certification are separate activities. Because AWS is transitioning this certification to DVA-C03, verify which exam code you intend to sit before scheduling or purchasing version-specific preparation.
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