AWS DVA-C02 Practice Test

DVA-C02 practice test: what's covered

• Developer Associate
• Lambda
• DynamoDB
• API Gateway
• IAM

Free DVA-C02 sample questions

1. A developer is creating a serverless application using AWS Lambda in Python 3.12. The application requires the external `requests` library, which is not included in the standard Lambda execution environment. Which packaging strategy represents the recommended AWS best practice?

   • A. Option A: Build a custom Lambda Layer containing the requests library and attach it to the function
   • B. Option B: Include pip install commands directly inside the Lambda handler function logic
   • C. Option C: Rewrite the entire application HTTP handling logic using the standard Python urllib library
   • D. Option D: Provision an Amazon EC2 instance to run the Python script continuously instead of serverless
   Show answer

   Correct: A. Option A is correct because building a custom Lambda Layer separates third-party dependencies from function deployment packages, keeping deployment ZIPs small, fast to deploy, and reusable across multiple Lambda functions. Option B is incorrect because installing dependencies at runtime adds execution latency and violates read-only container file system constraints. Option C is incorrect because refactoring core logic avoids dependency management at the cost of developer velocity. Option D is incorrect because introducing EC2 instances eliminates serverless automatic scaling and increases maintenance overhead.

2. An e-commerce company requires immediate read consistency after writing customer order records to an Amazon DynamoDB table. Which trade-off must the developer account for when choosing strongly consistent reads over eventually consistent reads?

   • A. Option A: Strongly consistent reads double Write Capacity Unit (WCU) consumption across global secondary indexes
   • B. Option B: Strongly consistent reads consume 2× Read Capacity Units (RCUs) and may incur slightly higher latency to return the latest committed write
   • C. Option C: Strongly consistent reads are completely free of extra cost but require an active ElastiCache cluster
   • D. Option D: Strongly consistent reads and eventually consistent reads have identical performance and RCU consumption
   Show answer

   Correct: B. Option B is correct because strongly consistent reads consume double the Read Capacity Units (1 RCU per 4 KB item compared to 0.5 RCU for eventually consistent reads) and require a response from all storage nodes. Option A is incorrect because read consistency settings do not alter WCU consumption. Option C is incorrect because consistent reads carry a financial cost and do not rely on ElastiCache. Option D is incorrect because consistency models differ significantly in cost and latency guarantees.

3. A developer has configured an AWS Lambda function to consume records from an Amazon DynamoDB Stream. How does the Lambda runtime handle record batch execution and retry failures during stream processing?

   • A. Option A: Lambda requires manual deletion of stream records after processing each individual event payload
   • B. Option B: Lambda requires an Amazon SQS queue in front of DynamoDB Streams to manage message acknowledgments
   • C. Option C: Lambda automatically advances the shard iterator on success, or retries the entire batch until success or expiration on thrown exceptions
   • D. Option D: Lambda automatically drops failed stream records without retrying to preserve high throughput processing
   Show answer

   Correct: C. Option C is correct because stream event source mappings automatically retry failing batches until records expire (up to 7 days) or reach max retry limits, and bisect-on-failure can isolate failing records. Option A is incorrect because stream records cannot be manually deleted by Lambda code. Option B is incorrect because DynamoDB Streams integrate directly with Lambda without needing SQS. Option D is incorrect because unhandled errors trigger continuous retries rather than silent record drops.

4. A developer is designing a serverless HTTP API fronting AWS Lambda functions for a public mobile app. The developer must implement JWT-based user authentication and rate limiting while minimizing cost. Which TWO AWS service configurations satisfy these requirements? (Choose TWO)

   • A. Option A: Deploy an Amazon API Gateway HTTP API with a native JWT Authorizer for Cognito authentication
   • B. Option B: Configure API Gateway usage plans and throttling limits to protect backend Lambda functions
   • C. Option C: Configure direct Lambda Function URLs with public unauthenticated access and in-memory rate limiting
   • D. Option D: Provision an Application Load Balancer with custom EC2 reverse proxies for token validation
   Show answer

   Correct: A and B. Options A and B are correct because API Gateway HTTP APIs provide lightweight JWT authorization natively without Lambda invocation overhead, and usage plans/throttling enforce rate limits efficiently at the API tier. Option C is incorrect because Function URLs lack native usage plans and built-in Cognito JWT authorizers. Option D is incorrect because deploying EC2 reverse proxies adds unnecessary infrastructure cost and maintenance overhead to a serverless architecture.

5. A cloud developer is provisioning a write-heavy Amazon DynamoDB table for an application that demands single-digit millisecond latency at scale. How should table capacity be configured to maintain optimal performance?

   • A. Option A: Always select provisioned capacity with static manual limits to prevent unexpected scaling costs
   • B. Option B: Always select On-Demand capacity because Provisioned mode cannot achieve single-digit millisecond latency
   • C. Option C: Deploy Amazon ElastiCache for Redis in front of the table because DynamoDB alone cannot deliver millisecond writes
   • D. Option D: Select either On-Demand capacity or Provisioned capacity with Application Auto Scaling based on workload predictability
   Show answer

   Correct: D. Option D is correct because DynamoDB natively delivers single-digit millisecond latency regardless of capacity mode; On-Demand handles unpredictable traffic bursts automatically, while Provisioned mode with auto-scaling optimizes cost for predictable workloads. Option A is incorrect because static manual provisioned capacity risks throttling during traffic spikes. Option B is incorrect because provisioned tables deliver identical latency. Option C is incorrect because DynamoDB natively achieves single-digit millisecond write performance without caching.

Last updated: 2026-10-19

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