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Note! DVA-C01 has been withdrawn. The new exam code is DVA-C02

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DVA-C01 Questions and Answers

Question # 1

A developer at a company recently created a serverless application to process and show data from business reports. The application's user interface (Ul) allow users to select and start processing the files. The Ul displays a message when the result is available to view. The application uses AWS Step Functions with A Lambda functions "to process the files. The developer used Amazon API Gateway and Lambda functions to create an API to support the Ul.

The company's Ul team reports that the request to process a file is often returning timeout errors because of the size or complexity of the files. The Ul team w< API to provide an immediate response so that the Ul can display a message while the files are being processed. The backend process that is invoked by the A needs to send an email message when the report processing is complete.

What should the developer do to configure the API to meet these requirements?

A.

Change the API Gateway route to add an X-Amz-lnvocation-Type header with a static value of 'Event' in the integration request. Deploy the API Gatt stage to apply the changes.

B.

Change the configuration of the Lambda function that implements the request to process a file. Configure the maximum age of the event so that the Lambda function will run asynchronously.

C.

Change the API Gateway timeout value to match the Lambda function timeout value. Deploy the API Gateway stage to apply the changes.

D.

Change the API Gateway route to add an X-Amz-Target header with a static value of 'Async' in the integration request. Deploy the API Gateway stag apply the changes.

Question # 2

A developer deploys an ecommerce application on Amazon EC2 instances behind an Application Load Balancer (ALB). The instances run in an Amazon EC2 Auto Scaling group. The EC2 instances are based on an Amazon Machine Image (AMI) that uses an Amazon Elastic Block Store (Amazon EBS) root volume. After deployment, the developer notices that a third of the instances seem to be idle. These instances are not receiving requests from the load balancer. The developer verifies that all the instances are registered with the load balancer. The developer must implement a solution to allow the EC2 instances to receive requests from the load balancer.

Which action will meet this requirement?

A.

Reregister the failed instances with the ALB.

B.

Enable all Availability Zones for the ALB.

C.

Use the instance refresh feature to redeploy the EC2 Auto Scaling group.

D.

Restart the EC2 instances that are not receiving traffic.

Question # 3

A developer needs to secure the static assets in a company's Amazon S3 bucket that is named DOC-EXAMPLE-BUCKET. The company has an Amazon CtoudFront distribution that serves the S3 bucket's assets to the public. The developer has already created the origin access identity (OAI) and has associated the OAI with the distribution. The developer must write a bucket policy that allows only the CloudFront distribution to access the S3 bucket

Which policy will meet this requirement MOST securely?

A)

DVA-C01 question answer

B)

DVA-C01 question answer

C)

DVA-C01 question answer

D)

DVA-C01 question answer

A.

Option A

B.

Option B

C.

Option C

D.

Option D

Question # 4

A developer wants to implement authentication using Amazon Cognito user pools for an existing API in Amazon API Gateway. After creating the Amazon Cognito user pool, the developer tests the GET request to the API. Unauthenticated requests to the API return a 200 OK status response.

Which combination of additional steps are required to complete the authentication implementation? (Select TWO.)

A.

Create an Amazon Cognito authonzer in API Gateway and specify the Amazon Cognito user pool.

B.

Create an AWS Lambda authorizer in API Gateway and specify the Amazon Cognito user pool.

C.

Specify the authofizer in the GET method section of API Gateway and redeploy the API.

D.

Use Amazon Cognito user pools to make and authenticate the request to API Gateway.

E.

Create an Amazon Cognito authorizer in API Gateway and specify the Amazon Cognito identity pool.

Question # 5

A developer is creating a web application that collects highly regulated and confidential user data through a POST request. The web application is served through Amazon CloudFront. User names and phone numbers must be encrypted at the edge and must remain encrypted throughout the entire application stack.

What is the MOST secure way to meet these requirements?

A.

Enforce Match Viewer with HTTPS Only on CloudFront.

B.

Use only the newest TLS security policy on CloudFront.

C.

Enforce a signed URL on CloudFront on the front end.

D.

Use field-level encryption on CloudFront.

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