Amazon DVA-C01 Online Practice Questions and Exam Preparation

Amazon DVA-C01 Online Questions & Answers

• Question 21:

  A developer is receiving an intermittent ProvisionedThroughputExceeded Exception error from an application that is based on Amazon DynamoDB. According to the Amazon CloudWatch metrics for the table, the application is not exceeding the provisioned throughput.

  What could be the cause of the issue?

  A. The DynamoDB table storage size is larger than the provisioned size

  B. The application is exceeding capacity on a particular hash key

  C. The DynamoDB table is exceeding the provisioned scaling operations

  D. The application is exceeding capacity on a particular sort key

  Correct Answer: A

  Reference: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Programming.Errors.html

• Question 22:

  A developer is creating a web service that will assist a company's new employees during onboarding. The web service must interact with several corporate systems. For example, the web service must log a request with the IT team for a new

  notebook and must request an access card from security. Each request can occur in parallel. When all the steps are complete, the web service returns either a successful response or an error.

  The web service is invoked by a single REST request to an Amazon API Gateway API. The REST request returns the reference number. Data that is captured can be captured only once.

  Which solution will meet these requirements MOST cost-effectively?

  A. Set up AWS Step Functions Synchronous Express Workflows to process the data

  B. Set up AWS Step Functions Asynchronous Express Workflows to process the data

  C. Set up AWS Step Functions Standard Workflows to process the data

  D. Set up Amazon Simple Notification Service (Amazon SNS) to process the data. Push the request to an HTTPS endpoint

  Correct Answer: C

• Question 23:

  A developer is designing a web application in which new users will use their email addresses to create accounts. Millions of users are expected to sign up. The application will store attributes for each user. Which AWS service or feature should the developer implement to meet these requirements?

  A. Amazon Cognito user pools

  B. AWS Mobile Hub User File Storage

  C. AWS AppSync

  D. AWS Mobile Hub Cloud Logic

  Correct Answer: A

  Reference: https://docs.aws.amazon.com/cognito/latest/developerguide/cognito-user-identity-pools.html

• Question 24:

  A developer at a company is using AWS CodeCommit to store code for an application. The developer has configured an AWS CodePipeline pipeline to be invoked by commits to the main branch in the CodeCommit repository. The pipeline

  will build the application and will deploy the application to a test environment.

  The developer needs to deploy the application to production. However, the company requires that all deployments go through a quality review before deployment to production.

  What should the developer do to meet these requirements?

  A. Add a manual approval step to the CodePipeline pipeline before a deployment step for the production environment.

  B. Create a second CodePipeline pipeline that is invoked by the main branch to build the application and deploy it to production.

  C. Configure the CodePipeline pipeline to deploy to production when quality reviewers approve a pull request.

  D. Add a deployment step for the production environment. Set the inputArtifacts element to “category”: “Approval”.

  Correct Answer: A

• Question 25:

  A developer has created an AWS Lambda function that is written in Python. The Lambda function reads data from objects in Amazon S3 and writes data to an Amazon DynamoDB table.

  The function is successfully invoked from an S3 event notification when an object is created. However, the function fails when it attempts to write to the DynamoDB table.

  What is the MOST likely cause of this issue?

  A. The Lambda function's concurrency limit has been exceeded

  B. The DynamoDB table requires a global secondary index (GSI) to support writes

  C. The Lambda function does not have IAM permissions to write to DynamoDB

  D. The DynamoDB table is not running in the same Availability Zone as the Lambda function

  Correct Answer: C

  Reference: https://aws.amazon.com/blogs/security/how-to-create-an-aws-iam-policy-to-grant-aws-lambda-access-to-an-amazon-dynamodb-table

• Question 26:

  A company has a large number of documents that are stored securely in Amazon S3. The company is creating an application that occasionally will read these documents. The application will be deployed on Amazon EC2 instances.

  The company's security requirements mandate that no long-term credentials can be stored on the EC2 instances and that only the needed documents can be accessed. Only authorized users and applications can access the documents,

  access must be logged by Amazon S3, and each document must follow S3 Lifecycle policies for archival and destruction.

  What should a developer do to meet these requirements?

  A. Create an event to invoke an AWS Lambda function when a document is uploaded. Configure the function to write the documents to an Amazon Elastic File System (Amazon EFS) file system. Configure the EC2 instances to mount the EFS file system. Configure the application to access the documents that are stored in the file system as needed.

  B. Create a user that has programmatic credentials, and attach a policy that allows read access to the S3 bucket. Use the AWS CLI to configure those credentials for the EC2 instances to use. Create an Amazon Machine Image (AMI), and add the access key and secret access key to the user data section to create environment variables. Use the AMI to launch each EC2 instance that runs the application. Add application code to use the keys that are stored in the environment variables to access the S3 bucket objects as needed.

  C. Modify the S3 bucket, make the bucket public, and make each object public. Add application code to make REST calls to access the objects in the S3 bucket as needed.

  D. Create an IAM role with permissions to read objects from Amazon S3. Attach the role to the EC2 instances as an instance profile. Add application code to access the objects in the S3 bucket as needed.

  Correct Answer: A

  Reference: https://docs.aws.amazon.com/lambda/latest/dg/services-efs.html

• Question 27:

  A team deployed an AWS CloudFormation template to update a stack that already included an Amazon RDS DB instance. However, before the deployment of the update, the team changed the name of the DB instance on the template by mistake. The DeletionPolicy attribute for all resources was not changed from the default values.

  What will be the result of this mistake?

  A. AWS CloudFormation will create a new database and delete the old one

  B. AWS CloudFormation will create a new database and keep the old one

  C. AWS CloudFormation will overwrite the existing database and rename it

  D. AWS CloudFormation will leave the existing database and will not create a new one

  Correct Answer: A

  Reference: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-attribute-updatereplacepolicy.html

• Question 28:

  A developer is creating an AWS CloudFormation template to deploy Amazon EC2 instances across multiple AWS accounts. The developer must choose the EC2 instances from a list of approved instance types. How can the developer incorporate the list of approved instance types in the CloudFormation template?

  A. Create a separate CloudFormation template for each EC2 instance type in the list.

  B. In the Resources section of the CloudFormation template, create resources for each EC2 instance type in the list.

  C. In the CloudFormation template, create a separate parameter for each EC2 instance type in the list.

  D. In the CloudFormation template, create a parameter with the list of EC2 instance types as AllowedValues.

  Correct Answer: D

  Reference: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/deploying.applications.html

• Question 29:

  A developer has written the following IAM policy to provide access to an Amazon S3 bucket:

  

  Which access does the policy allow regarding the s3:GetObject and s3:PutObject actions?

  A. Access on all buckets except the “DOC-EXAMPLE-BUCKET” bucket

  B. Access on all buckets that start with “DOC-EXAMPLE-BUCKET” except the “DOC-EXAMPLE-BUCKET/secrets” bucket

  C. Access on all objects in the “DOC-EXAMPLE-BUCKET” bucket along with access to all S3 actions for objects in the “DOC-EXAMPLE-BUCKET” bucket that start with “secrets”

  D. Access on all objects in the “DOC-EXAMPLE-BUCKET” bucket except on objects that start with “secrets”

  Correct Answer: B

  Reference: https://docs.aws.amazon.com/AmazonS3/latest/userguide/example-policies-s3.html

• Question 30:

  An application uploads photos to an Amazon S3 bucket. Each photo that is uploaded to the S3 bucket must be resized to a thumbnail image by the application. Each thumbnail image is uploaded with a new name in the same S3 bucket. Which AWS service can a developer configure to directly process each single S3 event for each S3 object upload?

  A. Amazon EC2

  B. Amazon Elastic Container Service (Amazon ECS)

  C. AWS Elastic Beanstalk

  D. AWS Lambda

  Correct Answer: D

  Reference: https://docs.aws.amazon.com/lambda/latest/dg/with-s3-example.html