DVA-C01 sample questions

Question 1

The developer needs to create an application that supports Security Assertion Markup Language (SAML) and Facebook authentication. It must also allow access to AWS services, such as Amazon DynamoDB.
Which AWS service or feature will meet these requirements with the LEAST amount of additional coding?

Accepted Answer

Amazon Cognito identity pools

Answer

Amazon Cognito user pools

Answer

Amazon Lambda@Edge

Answer

AWSAppSync

Question 2

A developer wants to ensure the Amazon EC2 instances in AWS Elastic Beanstalk execute a certain set of commands before the application is ready to use.
Which Elastic Beanstalk feature will allow the developer to accomplish this?

Accepted Answer

ebextensions

Answer

Immutable update

Answer

User data

Answer

Rolling update

Question 3

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 4

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 5

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 6

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 7

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 8

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 9

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 10

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.

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