DVA-C01 sample questions

Question 1

A Developer is using AWS CLI, but when running list commands on a large number of resources, it is timing out.
What can be done to avoid this time-out?

Accepted Answer

Use pagination

Answer

Use shorthand syntax

Answer

Use parameter values

Answer

Use quoting strings

Question 2

A developer is creating a script to automate the deployment process for a serverless application. The developer wants to use an existing AWS Serverless Application Model (AWS SAM) template for the application.
What should the developer use for the project? (Choose two.)

Accepted Answer

Call sam package to create the deployment package. Call sam deploy to deploy the package afterward.

Answer

Create a ZIP package and upload it to Amazon S3. Call aws cloudformation create-stack to create the application.

Answer

A Call aws cloudformation package to create the deployment package. Call aws cloudformation deploy to deploy the package afterward.

Answer

Create a ZIP package locally and call aws serverlessrepo create-application to create the application.

Answer

Call aws s3 cp to upload the AWS SAM template to Amazon S3. Call aws lambda update-function-code to create the application.

Question 3

An application is using Amazon DynamoDB as its data store, and should be able to read 100 items per second as strongly consistent reads. Each item is 5 KB in size.
To what value should the table’s provisioned read throughput be set?

50 read capacity units

Accepted Answer

200 read capacity units

Answer

100 read capacity units

Answer

50 read capacity units

Answer

500 read capacity units

Question 4

You have an AWS Elastic Beanstalk application environment that is currently coupled with an Amazon RDS database instance. Due to changing requirements, you need to remove the database from the Elastic Beanstalk environment while keeping the application running. The database should remain operational and be managed independently. What is the recommended approach to achieve this?

Accepted Answer

Use the Elastic Beanstalk CLI to disassociate the database.

Answer

Recreate a new Elastic Beanstalk environment without Amazon RDS.

Answer

Change the deployment policy to disassociate the database.

Answer

Use the AWS CLI to disassociate the database.

Question 5

A Developer has created an S3 bucket s3://mycoolapp and has enabled server across logging that points to the folder s3://mycoolapp/logs. The Developer moved 100 KB of Cascading Style Sheets (CSS) documents to the folder s3://mycoolapp/css, and then stopped work. When the developer came back a few days later, the bucket was 50 GB.
What is the MOST likely cause of this situation?

Accepted Answer

S3 replication was enabled on the bucket.

Answer

An S3 lifecycle policy has moved the entire CSS file to S3 Infrequent Access.

Answer

The CSS files were not compressed and S3 versioning was enabled.

Answer

Logging into the same bucket caused exponential log growth.

Question 6

A developer is building an application using an Amazon API Gateway REST API backend by an AWS Lambda function that interacts with an Amazon DynamoDB table. During testing, the developer observes high latency when making requests to the API.
How can the developer evaluate the end-to-end latency and identify performance bottlenecks?

Accepted Answer

Enable and configure AWS X-Ray tracing on API Gateway and the Lambda function. Use X-Ray to trace and analyze user requests.

Answer

Enable Amazon CloudWatch Logs for the Lambda function. Enable execution logs for API Gateway to view and analyze user request logs.

Answer

Enable VPC Flow Logs to capture and analyze network traffic within the VPC.

Answer

Enable AWS CloudTrail logging and use the logs to map each latency and bottleneck.

Question 7

AWS CodeBuild builds code for an application, creates the Docker image, pushes the image to Amazon Elastic Container Registry (Amazon ECR), and tags the image with a unique identifier.
If the Developers already have AWS CLI configured on their workstations, how can the Docker images be pulled to the workstations?

Accepted Answer

Run the output of the following:
aws ecr get-login
and then run:
docker pull REPOSITORY URI: TAG

Answer

Run the output of the following:
aws ecr get-download-url-for-layer
and then run:
docker pull REPOSITORY URI: TAG

Answer

un the following:
aws ecr get-login
and then run:
docker pull REPOSITORY URI: TAG

Answer

Run the following:
docker pull REPOSITORY URI: TAG

Question 8

An on-premises application makes repeated calls to store files to Amazon S3. As usage of the application has increased, “LimitExceeded” errors are being logged.
What should be changed to fix this error?

Accepted Answer

Implement exponential backoffs in the application.

Answer

Add a one second delay to each API call.

Answer

Load balance the application to multiple servers.

Answer

Move the application to Amazon EC2.

Question 9

An application is being developed to audit several AWS accounts. The application will run in Account A and must access AWS services in Accounts B and C.
What is the MOST secure way to allow the application to call AWS services in each audited account?

Accepted Answer

Configure cross-account roles in each audited account. Write code in Account A that assumes those roles

Answer

Use S3 cross-region replication to communicate among accounts, with Amazon S3 event notifications to trigger Lambda functions

Answer

Create an 1AM user with an access key in each audited account. Write code in Account A that uses those access keys

Answer

Deploy an application in each audited account with its own role. Have Account A authenticate with the application

Question 10

A Company runs continuous integration/continuous delivery (CI/CD) pipelines 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 pipelines?

Accepted Answer

Update the AWS CodeBuild specification to include a phase for running unit tests

Answer

Create a testing branch in AWS CodeCommit to run unit tests

Answer

install the AWS CodeDeploy agent on an Amazon EC2 instance to run unit tests

Answer

Create a separate CodePipeline pipeline to run unit tests

Free DVA-C01 sample questions

A Developer is using AWS CLI, but when running list commands on a large number of resources, it is timing out. What can be done to avoid this time-out?

A developer is creating a script to automate the deployment process for a serverless application. The developer wants to use an existing AWS Serverless Application Model (AWS SAM) template for the application. What should the developer use for the project? (Choose two.)

An application is using Amazon DynamoDB as its data store, and should be able to read 100 items per second as strongly consistent reads. Each item is 5 KB in size. To what value should the table’s provisioned read throughput be set? 50 read capacity units

An on-premises application makes repeated calls to store files to Amazon S3. As usage of the application has increased, “LimitExceeded” errors are being logged. What should be changed to fix this error?

An application is being developed to audit several AWS accounts. The application will run in Account A and must access AWS services in Accounts B and C. What is the MOST secure way to allow the application to call AWS services in each audited account?

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