Amazon DVA-C01 Online Practice Questions and Exam Preparation

Amazon DVA-C01 Online Questions & Answers

• Question 91:

  A developer is working on a web application that runs on Amazon Elastic Container Service (Amazon ECS) and uses an Amazon DynamoDB table to store data. The application performs a large number of read requests against a small set of the table data. How can the developer improve the performance of these requests'? (Select TWO )

  A. Create an Amazon ElastiCache cluster Configure the application to cache data in the cluster.

  B. Create a DynamoDB Accelerator (DAX) cluster Configure the application to use the DAX cluster for DynamoDB requests

  C. Configure the application to make strongly consistent read requests against the DynamoDB table

  D. Increase the read capacity of the DynamoDB table

  E. Enable DynamoDB adaptive capacity

  Correct Answer: AB

• Question 92:

  A developer has launched an application that calls an API by way of Amazon API Gateway. It offers information that changes several times a day, but is not updated in real time. The application has become so popular that the API endpoint is overloaded and that traffic to the endpoint must be reduced.

  What can the developer do to address the performance issues?

  A. Enable API caching in Amazon ElastiCache.

  B. Enable an Auto Scaling group on the endpoint service and database.

  C. Create an additional API Gateway and use an Application Load Balancer

  Correct Answer: A

• Question 93:

  A developer is working on a serverless application lhat needs lo 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 tabled

  A. Create an Amazon Kinesis data stream, and attach it to the DynamoDB table Create a trigger to connect the data stream to the Lambda function

  B. Create an Amazon EventBridge (Amazon CloudWatch Events) rule to invoke the Lambda function on a regular schedule Connect to the DynamoDB table from the Lambda function to detect changes

  C. Enable DynamoDB Streams on the table Create a trigger to connect the DynamoDB stream to the Lambda function

  D. Create an Amazon Kinesis Data Firehose delivery stream, and attach it to the DynamoDB table Configure the delivery stream destination as the Lambda function

  Correct Answer: C

• Question 94:

  Multiple development teams are working on a project to migrate a monolithic application to a microservices-based application running on AWS Lambda The teams need a way to centrally manage code that is shared across multiple functions

  Which approach requires the LEAST maintenance?

  A. Each team maintains the code for the common components in their own code repository. They build and deploy the components with their Lambda functions together.

  B. One team builds a Lambda layer to include the common components and shares the layer with the other teams

  C. Each team builds and publishes the component they want to share to an Amazon S3 bucket The Lambda functions will download the components from the bucket

  D. One team builds a Docker container for the common components and shares the container with the other teams

  Correct Answer: C

• Question 95:

  A company hosts a microservices application that uses Amazon API Gateway, AWS Lambda, Amazon Simple Queue Service (Amazon SOS), and Amazon DynamoDB, One of the Lambda functions adds messages to an SOS FIFO queue.

  When a developer checks the application logs, the developer finds a few duplicated items in a DynamoDB table. The items were inserted by another polling function that processes messages from the queue.

  What is the MOST likely cause of this issue?

  A. Write operations on the DynamoDB table are being throttled

  B. The SOS queue delivered the message to the function more than once

  C. API Gateway duplicated the message in the SOS queue

  D. The polling function timeout is greater than the queue visibility timeout

  Correct Answer: B

• Question 96:

  A developer used the BalehWnteltern API operation to insert items in an Amazon DynamoDB table OynamoDB returned a few items as unprocessed due to throttling The developer decides to retry the records on the unprocessed items

  What should the developer do to reprocess the records with the LEAST number of API calls'?

  A. Retry the BatchWriteltem operation immediately

  B. Perform the Putltem operation on the unprocessed items individually instead of using the BatchWriteltem operation

  C. Delay the BatchWriteltem operation by using progressively longer wait times between retries, or exponential backoff

  D. Delete the items that were successfully processed, and reissue a new BatchWriteltem operation

  Correct Answer: D

• Question 97:

  A company recently experienced some unexpected downtime. After investigating, the company determines that a developer mistakenly terminated several production Amazon EC2 instances.

  What should the company do to BEST protect against accidental terminations in the future.

  A. Enable EC2 termination protection on all production instances unless approval has been given through AWS Resource Access Manager.

  B. Modify the developer group's permissions policy to deny them access to delete production instances unless approved has been given through AWS Resource Access Manager.

  C. Modify the developer group's permission policy to require multi-factor authentication (MFA) only production instances are being delete Enable EC2 termination protection on production instances.

  D. Enable EC2 termination protection on production instances. Deny the developer group's permissions policy access to terminate instance. Create a new role that developer can assume when termination is necessary.

  Correct Answer: A

• Question 98:

  A developer wants to modify the following AWS Cloud Formation template to embed another CloudFormation stack: Which syntax should the developer add to the blank line of the CloudFormation template to meet this requirement?

  

  A. "Mapping" : "AWS::CloudFormation::Stack",

  B. "Type" : "AWS;:CloudFcrmation::NestedStack",

  C. "Typequot; :";AWS::CloudFormation::Stac";,

  D. "Mapping" : "AWS::CloudFormation::NestedStack",

  Correct Answer: A

• Question 99:

  A developer is using Amazon S3 as the event source that invokes a Lambda function when new objects are created in the bucket The event source mapping Information Is stored in the bucket notification configuration The developer is working with different versions of the Lambda function, and has a constant need to update notification configuration so that Amazon S3 invokes the correct version

  What is the MOST efficient and effective way to achieve mapping Between the S3 event and Lambda?

  A. Use a different Lambda trigger

  B. Use Lambda environment variables

  C. Use a Lambda alias

  D. Use Lambda tags.

  Correct Answer: A

• Question 100:

  A company runs continuous integration/continuous delivery (CI/CD) pipeline for its application on AWS CodePipeline. A developer must write unit tests and run them as part of the pipelines before staging the artifacts for testing. How should the Developer incorporate unit tests as part of CI/CD pipeline?

  A. Create a separate codePipline pipline to run unit tests.

  B. Update the AWS codeBuild build specification to include a phase for running unit tests.

  C. Install the AWS CodeDeploy agent on an Amazon EC2 instance to run unit tests.

  D. Create a testing branch in AWS CodeCommit to run unit tests.

  Correct Answer: B