DVA-C02 Free Practice Test

A company is building a serverless application on AWS. The application uses an AWS Lambda function to process customer orders 24 hours a day, 7 days a week. The Lambda function calls an external vendor's HTTP API to process payments.
During load tests, a developer discovers that the external vendor payment processing API occasionally times out and returns errors. The company expects that some payment processing API calls will return errors.
The company wants the support team to receive notifications in near real time only when the payment processing external API error rate exceed 5% of the total number of transactions in an hour. Developers need to use an existing Amazon Simple Notification Service (Amazon SNS) topic that is configured to notify the support team.
Which solution will meet these requirements?

1. A. Write the results of payment processing API calls to Amazon CloudWatc
2. B. Use Amazon CloudWatch Logs Insights to query the CloudWatch log
3. C. Schedule the Lambda function to check the CloudWatch logs and notify the existing SNS topic.
4. D. Publish custom metrics to CloudWatch that record the failures of the external payment processing APIcall
5. E. Configure a CloudWatch alarm to notify the existing SNS topic when error rate exceeds the specified rate.
6. F. Publish the results of the external payment processing API calls to a new Amazon SNS topi
7. G. Subscribe the support team members to the new SNS topic.
8. H. Write the results of the external payment processing API calls to Amazon S3. Schedule an Amazon Athena query to run at regular interval
9. I. Configure Athena to send notifications to the existing SNS topic when the error rate exceeds the specified rate.

Correct Answer: B

An application uses an Amazon EC2 Auto Scaling group. A developer notices that EC2 instances are taking a long time to become available during scale-out events. The UserData script is taking a long time to run.
The developer must implement a solution to decrease the time that elapses before an EC2 instance becomes available. The solution must make the most recent version of the application available at all times and must apply all available security updates. The solution also must minimize the number of images that are created. The images must be validated.
Which combination of steps should the developer take to meet these requirements? (Choose two.)

1. A. Use EC2 Image Builder to create an Amazon Machine Image (AMI). Install all the patches and agents that are needed to manage and run the applicatio
2. B. Update the Auto Scaling group launch configuration to use the AMI.
3. C. Use EC2 Image Builder to create an Amazon Machine Image (AMI). Install the latest version of the application and all the patches and agents that are needed to manage and run the applicatio
4. D. Update the Auto Scaling group launch configuration to use the AMI.
5. E. Set up AWS CodeDeploy to deploy the most recent version of the application at runtime.
6. F. Set up AWS CodePipeline to deploy the most recent version of the application at runtime.
7. G. Remove any commands that perform operating system patching from the UserData script.

Correct Answer: AB

A company has deployed an application on AWS Elastic Beanstalk. The company has configured the Auto Scaling group that is associated with the Elastic Beanstalk environment to have five Amazon EC2 instances. If the capacity is fewer than four EC2 instances during the deployment, application performance degrades. The company is using the all-at-once deployment policy.
What is the MOST cost-effective way to solve the deployment issue?

1. A. Change the Auto Scaling group to six desired instances.
2. B. Change the deployment policy to traffic splittin
3. C. Specify an evaluation time of 1 hour.
4. D. Change the deployment policy to rolling with additional batc
5. E. Specify a batch size of 1.
6. F. Change the deployment policy to rollin
7. G. Specify a batch size of 2.

Correct Answer: C

A developer is designing an AWS Lambda function that creates temporary files that are less than 10 MB during invocation. The temporary files will be accessed and modified multiple times during invocation. The developer has no need to save or retrieve these files in the future.
Where should the temporary files be stored?

1. A. the /tmp directory
2. B. Amazon Elastic File System (Amazon EFS)
3. C. Amazon Elastic Block Store (Amazon EBS)
4. D. Amazon S3

Correct Answer: A

An Amazon Kinesis Data Firehose delivery stream is receiving customer data that contains personally identifiable information. A developer needs to remove pattern-based customer identifiers from the data and store the modified data in an Amazon S3 bucket.
What should the developer do to meet these requirements?

1. A. Implement Kinesis Data Firehose data transformation as an AWS Lambda functio
2. B. Configure the function to remove the customer identifier
3. C. Set an Amazon S3 bucket as the destination of the delivery stream.
4. D. Launch an Amazon EC2 instanc
5. E. Set the EC2 instance as the destination of the delivery strea
6. F. Run an application on the EC2 instance to remove the customer identifier
7. G. Store the transformed data in anAmazon S3 bucket.
8. H. Create an Amazon OpenSearch Service instanc
9. I. Set the OpenSearch Service instance as the destination of the delivery strea
10. J. Use search and replace to remove the customer identifier
11. K. Export the data to an Amazon S3 bucket.
12. L. Create an AWS Step Functions workflow to remove the customer identifier
13. M. As the last step in the workflow, store the transformed data in an Amazon S3 bucke
14. N. Set the workflow as the destination of the delivery stream.

Correct Answer: A