DVA-C02 practice questions 391–400

1. Question 391 · 548 in bank

   A developer is building an application that uses an AWS Lambda function to process data. The application requires minimum latency. The Lambda function must have predictable function start times. All setup activities for the execution environment must happen before invocation of the Lambda function. Which solution will meet these requirements?

   • AIncrease the memory of the Lambda function to the maximum amount. Configure an Amazon EventBridge rule to schedule invocations of the Lambda function every minute to keep the execution environment active.
   • BOptimize the static initialization code that runs when a new execution environment is prepared for the first time. Decrease and compress the size of the Lambda function package and the imported libraries and dependencies.
   • CIncrease the reserved concurrency of the Lambda function to the maximum value for unreserved account concurrency. Run any setup activities manually before the initial invocation of the Lambda function.
   • DPublish a new version of the Lambda function. Configure provisioned concurrency for the Lambda function with the required minimum number of execution environments.

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   Answer: D

   Explanation

   The developer's requirements—minimum latency, predictable function start times, and all setup activities completed before invocation—point towards using AWS Lambda provisioned concurrency.

   Source: Adapted from community discussion — ShakthiGCP

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2. Question 392 · 548 in bank

   A company has implemented a pipeline in AWS CodePipeline. The company is using a single AWS account and does not use AWS Organizations. The company needs to test its AWS CloudFormation templates in its primary AWS Region and a disaster recovery Region. Which solution will meet these requirements with the MOST operational efficiency?

   • AIn the CodePipeline pipeline, implement an AWS CodeDeploy action for each Region to deploy and test the CloudFormation templates. Update CodePipeline and AWS CodeBuild with appropriate permissions.
   • BConfigure CodePipeline to deploy and test the CloudFormation templates. Use CloudFormation StackSets to start deployment across both Regions.
   • CConfigure CodePipeline to invoke AWS CodeBuild to deploy and test the CloudFormation templates in each Region. Update CodeBuild and CloudFormation with appropriate permissions.
   • DUse the Snyk action in CodePipeline to deploy and test the CloudFormation templates in each Region.

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   Answer: B

   Explanation

   AWS CloudFormation StackSets extends the capability of stacks by allowing you to create, update, or delete stacks across multiple accounts and AWS Regions with a single operation. Using an administrator account, you define and manage a CloudFormation template, and use the template as the basis for provisioning stacks into selected target accounts across specified AWS Regions.

   Source: Adapted from community discussion — xdeveloper

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3. Question 393 · 548 in bank

   A company has an Amazon API Gateway REST API that integrates with an AWS Lambda function. The API’s development stage references a development alias of the Lambda function named dev. A developer needs make a production alias of the Lambda function named prod available through the API. Which solution meets these requirements?

   • ACreate a new method on the API. Name the method production. Configure the method to include a stage variable that points to the prod Lambda function alias.
   • BCreate a new method on the API. Name the method production. Configure an integration request on the API’s development stage that points to the prod Lambda function alias.
   • CDeploy the API to a new stage named production. Configure the stage to include a stage variable that points to the prod Lambda function alias.
   • DDeploy the API to a new stage named production. Configure an integration request on the API’s production stage that points to the prod Lambda function alias.

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   Answer: C

   Explanation

   C is the correct answer. D is wrong as directly configuring the integration request on the production stage is not ideal. You should use stage variables to configure the integration dynamically, allowing you to manage different environments without manually changing the integration in each stage.

   Source: Adapted from community discussion — Arad

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4. Question 394 · 548 in bank

   A developer is working on a serverless application that needs to process any changes to an Amazon DynamoDB table with an AWS Lambda function. How should the developer configure the Lambda function to detect changes to the DynamoDB table?

   • ACreate an Amazon Kinesis data stream, and attach it to the DynamoDB table. Create a trigger to connect the data stream to the Lambda function.
   • BCreate an Amazon EventBridge rule to invoke the Lambda function on a regular schedule. Conned to the DynamoDB table from the Lambda function to detect changes.
   • CEnable DynamoDB Streams on the table. Create a trigger to connect the DynamoDB stream to the Lambda function.
   • DCreate an Amazon Kinesis Data Firehose delivery stream, and attach it to the DynamoDB table. Configure the delivery stream destination as the Lambda function.

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   Answer: C

   Explanation

   C Enabling DynamoDB Streams on the table allows you to capture and process changes (inserts, updates, deletes) to the table in real-time. You can then create a Lambda trigger that listens to the DynamoDB stream and invokes the Lambda function whenever there is a change in the table. This is a common and effective way to react to changes in DynamoDB tables with AWS Lambda functions.

   Source: Adapted from community discussion — nmc12

   References

   • AWS documentation
   • AWS documentation

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5. Question 395 · 548 in bank

   A developer is implementing a serverless application by using AWS CloudFormation to provision Amazon S3 web hosting. Amazon API Gateway, and AWS Lambda functions. The Lambda function source code is zipped and uploaded to an S3 bucket. The S3 object key of the zipped source code is specified in the Lambda resource in the CloudFormation template. The developer notices that there are no changes in the Lambda function every time the CloudFormation stack is updated. How can the developer resolve this issue?

   • ACreate a new Lambda function alias before updating the CloudFormation stack.
   • BChange the S3 object key or the S3 version in the CloudFormation template before updating the CloudFormation stack.
   • CUpload the zipped source code to another S3 bucket before updating the CioudFormation stack.
   • DAssociate a cade signing configuration with the Lambda function before updating the CloudFormation stack.

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   Answer: B

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6. Question 396 · 548 in bank

   A developer published a change to a new version of an AWS Lambda function. To test the change, the developer must route 50% of the traffic to the new version and 60% of the traffic to the current version. What is the MOST operationally efficient way to meet this requirement?

   • ACreate two Amazon Route 53 records that use a simple routing policy to route traffic to the different versions of the Lambda function. Create another Route 53 record that uses a weighted routing policy to route 50% of the traffic to each simple routing record. Test the Lambda function by using the weighted routing record.
   • BCreate an Amazon API Gateway API with a POST method that is integrated with the Lambda function. Add a stage variable that includes the version of the Lambda function. Add a canary release that will override the version variable 50% of the time. Deploy and test the Lambda function through the API Gateway stage.
   • CCreate a Lambda function alias. Set the weight to 50% for the current version and 50% for the new version. Set the event source mappings for the Lambda function to point to the alias.
   • DUpdate the event source mappings for the Lambda function. In the mappings, set the weight to 50% for the current version and 50% for the new version.

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   Answer: C

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7. Question 397 · 548 in bank

   A developer is building an application that processes a stream of user-supplied data. The data stream must be consumed by multiple Amazon EC2 based processing applications in parallel and in real time. Each processor must be able to resume without losing data if there is a service interruption. The application architect plans to add other processors in the near future, and wants to minimize the amount of data duplication involved. Which solution will satisfy these requirements?

   • APublish the data to Amazon Simple Queue Service (Amazon SQS).
   • BPublish the data to Amazon Data Firehose.
   • CPublish the data to Amazon EventBridge.
   • DPublish the data to Amazon Kinesis Data Streams.

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   Answer: D

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8. Question 398 · 548 in bank

   An application is experiencing performance issues based on increased demand. This increased demand is on read-only historical records pulled from an Amazon RDS-hosted database with custom views and queries. A developer must improve performance without changing the database structure. Which approach will improve performance and MINIMIZE management overhead?

   • ADeploy Amazon DynamoDB, move all the data, and point to DynamoDB.
   • BDeploy Amazon ElastiCache (Redis OSS) and cache the data for the application.
   • CDeploy Memcached on Amazon EC2 and cache the data for the application.
   • DDeploy Amazon DynamoDB Accelerator (DAX) on Amazon RDS to improve cache performance.

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   Answer: C

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9. Question 399 · 548 in bank

   A developer is using AWS CloudFormation to deploy an AWS Lambda function. The developer needs to set the Lambda function's timeout value based on the environment parameter of the template. The template contains mappings of EnvironmentData for each environment's timeout value. The environment parameter and EnvironmentData mappings are as follows: Environment parameter:

   

   EnvironmentData mappings:

   

   Which statement will meet these requirements?

   • ATimeout: !GetAtt [EnvironmentData, !Ref Environment, Timeout]
   • BTimeout: !FindInMap [EnvironmentData, !Ref Environment, Timeout]
   • CTimeout: !Select [EnvironmentData, !Ref Environment, Timeout]
   • DTimeout: !ForEach[EnvironmentData, !Ref Environment, Timeout]

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   Answer: B

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10. Question 400 · 548 in bank

    A company’s AWS accounts are in an organization in AWS Organizations. An application in Account A uses environment variables that are stored as parameters in AWS Systems Manager Parameter Store. A developer is creating a new application in Account B that needs to use the same environment variables. The application in Account B needs access to the parameters in Account A without duplicating the parameters into Account B. Which solution will meet these requirements with the LEAST operational overhead?

    • AConfigure the application in Account B to use credentials for an IAM user in AccountA that has access to the parameters.
    • BCreate an assumable IAM role in Account A. Grant the role the permission to access the parameters.
    • CConfigure cross-account resource sharing for the parameters by using AWS Resource Access Manager (AWS RAM).
    • DWrite a script that stores the parameter values in a private Amazon S3 bucket that both accounts can access.

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    Answer: C

    References

    • AWS documentation

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DVA-C02 practice, question 391. 548 questions available.