Free Amazon DVA-C02 Exam Questions

Question 1

A company is adopting serverless computing for some of its new services. A development team needs to create a serverless infrastructure by using AWS Serverless Application Model (AWS SAM). All infrastructure must be deployed by using AWS CloudFormation templates.

What should the development team do to meet these requirements?

A : Add a Resources section to the CloudFormation templates that contains AWS::Lambda::Function resources.

B : Add a Mappings section to the CloudFormation templates that contains AWS::Serverless::Function and AWS::Serverless::API.

C : Add a Transform section to the CloudFormation templates. Use the AWS SAM syntax to define the resources.

D : Add a Parameters section to the CloudFormation templates that specifies the relevant AWS SAM Globals section.

Answer: D

Question 2

A developer is using an AWS CloudFormation template to create a pipeline in AWS CodePipeline. Thetemplate creates an Amazon S3 bucket that the pipeline references in a source stage. The template also createsan AWS CodeBuild project for a build stage. The pipeline sends notifications to an Amazon SNS topic. Logsfor the CodeBuild project are stored in Amazon CloudWatch Logs.The company needs to ensure that the pipeline's artifacts are encrypted with an existing customer-managedAWS KMS key. The developer has granted the pipeline permissions to use the KMS key.Which additional step will meet these requirements?

A : Create an Amazon S3 gateway endpoint that the pipeline can access.

B : In the CloudFormation template, use the KMS key to encrypt the logs in CloudWatch Logs.

C : Apply an S3 bucket policy that ensures the pipeline sends only encrypted objects to the S3 bucket.

D : Configure the notification topic to use the existing KMS key to enable encryption with the existing KMS key.

Answer: C

Question 3

An application collects data from sensors in a manufacturing facility. The data is stored in an Amazon SQS Standard queue by an AWS Lambda function and an Amazon EC2 instance processes the data and stores it in an Amazon RedShift data warehouse. A fault in the sensors’ software is causing occasional duplicate messages to be sent. Timestamps on the duplicate messages show they are generated within a few seconds of the primary message.

How can a Developer prevent duplicate data being stored in the data warehouse?

A : a FIFO queue and configure the Lambda function to add a message group ID to the messages generated by each individual sensor

B : nd a ChangeMessageVisibility call with VisibilityTimeout set to 30 seconds after the receipt of every message from the queue

C : nfigure a redrive policy, specify a destination Dead-Letter queue, and set the maxReceiveCount to 1

D : a FIFO queue and configure the Lambda function to add a message deduplication token to the message body

Answer: D

Question 4

A company recently deployed a new serverless user portal. Users have reported that part of the portal is slow. The initial analysis found a single Amazon API Gateway endpoint that is responsible for the performance issues. The endpoint integrates with an AWS Lambda function. However, the Lambda function interacts with other APIs and AWS services.

How can a developer find the source of the increased response time by using operational best practices?

A : Update the Lambda function by adding logging statements with high-precision timestamps before and after each external request. Deploy the updated Lambda function. After accumulating enough usage data, examine the Amazon CloudWatch logs for the Lambda function to determine the likely sources for the increased response time.

B : Instrument the Lambda function with the AWS X-Ray SDK. Add HTTP and HTTPS interceptors and SDK client handlers. Deploy the updated Lambda function. Turn on X-Ray tracing. After accumulating enough usage data, use the X-Ray service map to examine the average response times to determine the likely sources.

C : Review the Lambda function's Amazon CloudWatch metrics by using the metrics explorer. Apply anomaly detection to the Duration metric and the Throttles metric. Review the anomalies to determine the likely sources.

D : Use Amazon CloudWatch Synthetics to create a new canary. Turn on AWS X-Ray tracing on the canary. Configure the canary to scan the user portal. After accumulating enough usage data, use the CloudWatch Synthetics canary dashboard to view the metrics from the canary.

Answer: B

Question 5

A web application has been deployed on AWS. A developer is concerned about exposure to common exploits that could affect application availability or compromise security. Which AWS service can protect from these threats?

A : CloudHSM

B : CloudFront

C : azon Cognito

D : Web Application Firewall (WAF)

Answer: D