DVA-C02 practice questions 471–480

1. Question 471 · 548 in bank

   A developer is using an AWS Lambda function to generate avatars for profile pictures that are uploaded to an Amazon S3 bucket. The Lambda function is automatically invoked for profile pictures that are saved under the /original/ S3 prefix. The developer notices that some pictures cause the Lambda function to time out. The developer wants to implement a fallback mechanism by using another Lambda function that resizes the profile picture. Which solution will meet these requirements with the LEAST development effort?

   • ASet the image resize Lambda function as a destination of the avatar generator Lambda function for the events that fail processing.
   • BCreate an Amazon Simple Queue Service (Amazon SQS) queue. Set the SQS queue as a destination with an on failure condition for the avatar generator Lambda function. Configure the image resize Lambda function to poll from the SQS queue.
   • CCreate an AWS Step Functions state machine that invokes the avatar generator Lambda function and uses the image resize Lambda function as a fallback. Create an Amazon EventBridge rule that matches events from the S3 bucket to invoke the state machine.
   • DCreate an Amazon Simple Notification Service (Amazon SNS) topic. Set the SNS topic as a destination with an on failure condition for the avatar generator Lambda function. Subscribe the image resize Lambda function to the SNS topic.

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   Answer: A

   Explanation

   Previously, you needed to write the SQS/SNS/EventBridge handling code within your Lambda function and manage retries and failures yourself. With Destinations, you can route asynchronous function results as an execution record to a destination resource without writing additional code. https://aws.amazon.com/ru/blogs/compute/introducing-aws-lambda-destinations/

   Source: Adapted from community discussion — jingle4944

   References

   • AWS documentation
   • AWS documentation

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2. Question 472 · 548 in bank

   A developer has an application container, an AWS Lambda function, and an Amazon Simple Queue Service (Amazon SQS) queue. The Lambda function uses the SQS queue as an event source. The Lambda function makes a call to a third-party machine learning API when the function is invoked. The response from the third-party API can take up to 60 seconds to return. The Lambda function's timeout value is currently 65 seconds. The developer has noticed that the Lambda function sometimes processes duplicate messages from the SQS queue. What should the developer do to ensure that the Lambda function does not process duplicate messages?

   • AConfigure the Lambda function with a larger amount of memory.
   • BConfigure an increase in the Lambda function’s timeout value.
   • CConfigure the SQS queue’s delivery delay value to be greater than the maximum time it takes to call the third-party API.
   • DConfigure the SQS queue’s visibility timeout value to be greater than the maximum time it takes to call the third-party API.

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   Answer: D

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3. Question 473 · 548 in bank

   A company has an application that runs on Amazon EC2 instances. The application needs to use dynamic feature flags that will be shared with other applications. The application must poll on an interval for new feature flag values. The values must be cached when they are retrieved. Which solution will meet these requirements in the MOST operationally efficient way?

   • AStore the feature flag values in AWS Secrets Manager. Configure an Amazon ElastiCache node to cache the values by using a lazy loading strategy in the application. Update the application to poll for the values on an interval from ElastiCache.
   • BStore the feature flag values in an Amazon DynamoDB table. Configure DynamoDB Accelerator (DAX) to cache the values by using a lazy loading strategy in the application. Update the application to poll for the values on an interval from DynamoDB.
   • CStore the feature flag values in AWS AppConfig. Configure AWS AppConfig Agent on the EC2 instances to poll for the values on an interval. Update the application to retrieve the values from the AppConfig Agent localhost endpoint.
   • DStore the feature flag values in AWS Systems Manager Parameter Store. Configure the application to poll on an interval. Configure the application to use the AWS SDK to retrieve the values from Parameter Store and to store the values in memory.

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   Answer: B

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4. Question 474 · 548 in bank

   A team deploys an AWS CloudFormation template to update a stack that already included an Amazon DynamoDB table. However, before the deployment of the update, the team changed the name of the DynamoDB table on the template by mistake. The DeletionPolicy attribute for all resources has the default value. What will be the result of this mistake?

   • ACloudFormation will create a new table and will delete the existing table.
   • BCloudFormation will create a new table and will keep the existing table.
   • CCloudFormation will overwrite the existing table and will rename the existing table.
   • DCloudFormation will keep the existing table and will not create a new table.

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   Answer: A

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5. Question 475 · 548 in bank

   A developer is deploying an application on an Amazon Elastic Container Service (Amazon ECS) cluster that uses AWS Fargate. The developer is using a Docker container with an Ubuntu image. The developer needs to implement a solution to store application data that is available from multiple ECS tasks. The application data must remain accessible after the container is terminated. Which solution will meet these requirements?

   • AAttach an Amazon FSx for Windows File Server volume to the container definition.
   • BSpecify the DockerVolumeConfiguration parameter in the ECS task definition to attach a Docker volume.
   • CCreate an Amazon Elastic File System (Amazon EFS) file system. Specify the mountPoints attribute and the efsVolumeConfiguration attribute in the ECS task definition.
   • DCreate an Amazon Elastic Block Store (Amazon EBS) volume. Specify the mount point configuration in the ECS task definition.

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   Answer: C

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6. Question 476 · 548 in bank

   A developer is creating an AWS Lambda function that needs network access to private resources in a VPC. Which solution will provide this access with the LEAST operational overhead?

   • AAttach the Lambda function to the VPC through private subnets. Create a security group that allows network access to the private resources. Associate the security group with the Lambda function.
   • BConfigure the Lambda function to route traffic through a VPN connection. Create a security group that allows network access to the private resources. Associate the security group with the Lambda function.
   • CConfigure a VPC endpoint connection for the Lambda function. Set up the VPC endpoint to route traffic through a NAT gateway.
   • DConfigure an AWS PrivateLink endpoint for the private resources. Configure the Lambda function to reference the PrivateLink endpoint.

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   Answer: A

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7. Question 477 · 548 in bank

   A developer needs to automate deployments for a serverless, event-based workload. The developer needs to create standardized templates to define the infrastructure and to test the functionality of the workload locally before deployment The developer already uses a pipeline in AWS CodePipeline. The developer needs to incorporate any other infrastructure changes into the existing pipeline. Which solution will meet these requirements?

   • ACreate an AWS Serverless Application Model (AWS SAM) template. Configure the pipeline stages in CodePipeline to run the necessary AWS SAM CLI commands to deploy the serverless workload.
   • BCreate an AWS Step Functions workflow template based on the infrastructure by using the Amazon States Language. Start the Step Functions state machine from the existing pipeline.
   • CCreate an AWS CloudFormation template. Use the existing pipeline workflow to build a pipeline for AWS CloudFormation stacks.
   • DCreate an AWS Serverless Application Model (AWS SAM) template. Use an automated script to deploy the serverless workload by using the AWS SAM CLI deploy command.

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   Answer: A

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8. Question 478 · 548 in bank

   A developer is creating a stock trading application. The developer needs a solution to send text messages to application users to confirmation when a trade has been completed. The solution must deliver messages in the order a user makes stock trades. The solution must not send duplicate messages. Which solution will meet these requirements?

   • AConfigure the application to publish messages to an Amazon Data Firehose delivery stream. Configure the delivery stream to have a destination of each user’s mobile phone number that is passed in the trade confirmation message.
   • BCreate an Amazon Simple Queue Service (Amazon SQS) FIFO queue. Use the SendMessageIn API call to send the trade confirmation messages to the queue. Use the SendMessageOut API to send the messages to users by using the information provided in the trade confirmation message.
   • CConfigure a pipe in Amazon EventBridge Pipes. Connect the application to the pipe as a source. Configure the pipe to use each user’s mobile phone number as a target. Configure the pipe to send incoming events to the users.
   • DCreate an Amazon Simple Notification Service (SNS) FIFO topic. Configure the application to use the AWS SDK to publish notifications to the SNS topic to send SMS messages to the users.

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   Answer: D

   Explanation

   Thought one. I would say D - using SNS but it costs operation work. B seems right but there is no SendMessageIn and SendMessageOut API operations

   Source: Adapted from community discussion — 0bdf3af

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9. Question 479 · 548 in bank

   A developer is deploying a new Node.js AWS Lambda function that is not connected to a VPC. The Lambda function needs to connect to and query an Amazon Aurora database that is not publicly accessible. The developer is expecting unpredictable surges in database traffic. What should the developer do to give the Lambda function access to the database?

   • AConfigure the Lambda function to use an Amazon RDS proxy.
   • BConfigure a NAT gateway. Attach the NAT gateway to the Lambda function.
   • CEnable public access on the Aurora database. Configure a security group on the database to allow outbound access for the database engine’s port.
   • DEnable VPC access for the Lambda function. Attach the Lambda function to a new security group that does not have rules.

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   Answer: A

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10. Question 480 · 548 in bank

    A company uses two AWS accounts: production and development. The company stores data in an Amazon S3 bucket that is in the production account. The data is encrypted with an AWS Key Management Service (AWS KMS) customer managed key. The company plans to copy the data to another S3 bucket that is in the development account. A developer needs to use a KMS key to encrypt the data in the S3 bucket that is in the development account. The KMS key in the development account must be accessible from the production account, Which solution will meet these requirements?

    • AReplicate the customer managed KMS key from the production account to the development account. Specify the production account in the key policy.
    • BCreate a new customer managed KMS key in the development account. Specify the production account in the key policy.
    • CCreate a new AWS managed KMS key for Amazon S3 in the development account. Specify the production account in the key policy.
    • DReplicate the default AWS managed KMS key for Amazon S3 from the production account to the development account. Specify the production account in the key policy.

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    Answer: C

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DVA-C02 practice, question 471. 548 questions available.