Task 1: Develop Code for Applications Hosted on AWS DVA-C02 Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   Which scenario is best suited for asynchronous communication?

   • AA payment processing request that requires an immediate confirmation.
   • BA database query that must return results to display on a webpage.
   • CA user login request that must return a success or failure immediately.
   • DAn order confirmation email that can be sent after the order is placed.
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2. 17application · medium

   A developer is working in the AWS IDE Toolkit (e.g., VS Code) on a Lambda function that uses the AWS SDK to interact with S3 and DynamoDB. The developer is unsure about the correct SDK method to use for a conditional update on a DynamoDB item. The developer wants to use Amazon Q Developer to get a code suggestion. What is the most efficient way to use Amazon Q Developer in this context?

   • AUse the AWS CLI to run the update-item command and copy the output into the code.
   • BOpen the AWS documentation website and search for the DynamoDB update method.
   • CAsk a colleague who has experience with DynamoDB to write the code.
   • DType a comment describing the desired operation in the code editor and let Amazon Q Developer generate the code suggestion.
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4. 18foundation · easy

   Which characteristic is typical of a stateless application component?

   • AIt stores session data on the server between requests.
   • BIt requires sticky sessions to maintain client state.
   • CIt must use a relational database to persist state.
   • DIt can be scaled horizontally by adding more instances without affecting existing sessions.
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5. 19foundation · easy

   What is Amazon Q Developer primarily used for?

   • ACreating S3 buckets.
   • BManaging EC2 instances.
   • CMonitoring CloudWatch alarms.
   • DGenerating code suggestions and assisting with debugging in the IDE.
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6. 20application · medium

   A developer is using AWS SAM to build a serverless application with several Lambda functions. The developer wants to write unit tests for the business logic in these functions that run quickly in a CI/CD pipeline without deploying to AWS or making network calls. Which testing approach should the developer use?

   • AUse the AWS SDK to call the Lambda function in the cloud and assert on the response.
   • BUse the sam local invoke command to run each function locally against a mock AWS service endpoint.
   • CDeploy the application to a development environment and run integration tests against the deployed API endpoints.
   • DWrite tests using a test framework like Jest or pytest that import the function's business logic modules directly and mock AWS SDK calls.
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