Amazon DVA-C01 Online Practice Questions and Exam Preparation

Amazon DVA-C01 Online Questions & Answers

• Question 611:

  A social media company is using Amazon Cognito in order to synchronize profiles across different mobile devices, to enable end users to have a seamless experience. Which of the following configurations can be used to silently notify users whenever an update is available on all other devices?

  A. Modify the user pool to include all the devices which keep them in sync.

  B. Use the SyncCallback interface to receive notifications on the application.

  C. Use an Amazon Cognito stream to analyze the data and push the notifications.

  D. Use the push synchronization feature with the appropriate IAM role.

  Correct Answer: D

  https://docs.aws.amazon.com/cognito/latest/developerguide/push-sync.html

• Question 612:

  An application on AWS is using third-party APIs. The Developer needs to monitor API errors in the code, and wants to receive notifications if failures go above a set threshold value. How can the Developer achieve these requirements?

  A. Publish a custom metric on Amazon CloudWatch and use Amazon SES for notification.

  B. Use an Amazon CloudWatch API-error metric and use Amazon SNS for notification.

  C. Use an Amazon CloudWatch API-error metric and use Amazon SES for notification.

  D. Publish a custom metric on Amazon CloudWatch and use Amazon SNS for notification.

  Correct Answer: D

• Question 613:

  A Developer has created a Lambda function and is finding that the function is taking longer to complete than expected. After some debugging, the Developer has discovered that increasing compute capacity would improve performance. How can the Developer increase the Lambda compute resources?

  A. Run on a larger instance size with more compute capacity.

  B. Increase the maximum execution time.

  C. Specify a larger compute capacity when calling the Lambda function.

  D. Increase the allocated memory for the Lambda function.

  Correct Answer: D

• Question 614:

  A Developer has been asked to build a real-time dashboard web application to visualize the key prefixes and storage size of objects in Amazon S3 buckets. Amazon DynamoDB will be used to store the Amazon S3 metadata. What is the optimal and MOST cost-effective design to ensure that the real-time dashboard is kept up to date with the state of the objects in the Amazon S3 buckets?

  A. Use an Amazon CloudWatch event backed by an AWS Lambda function. Issue an Amazon S3 API call to get a list of all Amazon S3 objects and persist the metadata within DynamoDB. Have the web application poll the DynamoDB table to reflect this change.

  B. Use Amazon S3 Event Notification backed by a Lambda function to persist the metadata into DynamoDB. Have the web application poll the DynamoDB table to reflect this change.

  C. Run a cron job within an Amazon EC2 instance to list all objects within Amazon S3 and persist the metadata into DynamoDB. Have the web application poll the DynamoDB table to reflect this change.

  D. Create a new Amazon EMR cluster to get all the metadata about Amazon S3 objects; persist the metadata into DynamoDB. Have the web application poll the DynamoDB table to reflect this change.

  Correct Answer: B

• Question 615:

  What AWS products and features can be deployed by Elastic Beanstalk? Choose 3 answers

  A. Auto scaling groups

  B. Route 53 hosted zones

  C. Elastic Load Balancers

  D. RDS Instances

  E. Elastic IP addresses

  F. SQS Queues

  Correct Answer: ACD

  https://aws.amazon.com/elasticbeanstalk/faqs/

  Q: What are the Cloud resources powering my AWS Elastic Beanstalk application?

  AWS Elastic Beanstalk uses proven AWS features and services, such as Amazon EC2, Amazon RDS, Elastic Load Balancing, Auto Scaling, Amazon S3, and Amazon SNS, to create an environment that runs your application. The current

  version of AWS Elastic Beanstalk uses the Amazon Linux AMI or the Windows Server 2012 R2 AMI.

• Question 616:

  Which of the following items are required to allow an application deployed on an EC2 instance to write data to a DynamoDB table? Assume that no security Keys are allowed to be stored on the EC2 instance. Choose 2 answers

  A. Create an IAM User that allows write access to the DynamoDB table.

  B. Add an IAM Role to a running EC2 instance.

  C. Add an IAM User to a running EC2 Instance.

  D. Launch an EC2 Instance with the IAM Role included in the launch configuration.

  E. Create an IAM Role that allows write access to the DynamoDB table.

  F. Launch an EC2 Instance with the IAM User included in the launch configuration.

  Correct Answer: BE

  https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html#attach- iam-role

• Question 617:

  A Developer executed a AWS CLI command and received the error shown below:

  

  What action should the Developer perform to make this error human-readable?

  A. Make a call to AWS KMS to decode the message.

  B. Use the AWS STS decode-authorization-message API to decode the message.

  C. Use an open source decoding library to decode the message.

  D. Use the AWS IAM decode-authorization-message API to decode this message.

  Correct Answer: B

  https://docs.aws.amazon.com/cli/latest/reference/sts/decode-authorization-message.html

  The message is encoded because the details of the authorization status can constitute privileged information that the user who requested the operation should not see. To decode an authorization status message, a user must be granted permissions via an IAM policy to request the DecodeAuthorizationMessage (sts:DecodeAuthorizationMessage ) action.

• Question 618:

  A Developer is asked to implement a caching layer in front of Amazon RDS. Cached content is expensive to regenerate in case of service failure. Which implementation below would work while maintaining maximum uptime?

  A. Implement Amazon ElastiCache Redis in Cluster Mode

  B. Install Redis on an Amazon EC2 instance.

  C. Implement Amazon ElastiCache Memcached.

  D. Migrate the database to Amazon Redshift.

  Correct Answer: A

  https://docs.aws.amazon.com/AmazonElastiCache/latest/mem-ug/SelectEngine.html

• Question 619:

  An application deployed on AWS Elastic Beanstalk experiences increased error rates during deployments of new application versions, resulting in service degradation for users. The Development team believes that this is because of the reduction in capacity during the deployment steps. The team would like to change the deployment policy configuration of the environment to an option that maintains full capacity during deployment while using the existing instances.

  Which deployment policy will meet these requirements while using the existing instances?

  A. All at once

  B. Rolling

  C. Rolling with additional batch

  D. Immutable

  Correct Answer: C

  https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/using-features.rolling-version-deploy.html

• Question 620:

  A Developer is going to deploy an AWS Lambda function that requires significant CPU utilization. Which approach will MINIMIZE the average runtime of the function?

  A. Deploy the function into multiple AWS Regions

  B. Deploy the function into multiple Availability Zones

  C. Deploy the function using Lambda layers

  D. Deploy the function with its memory allocation set to the maximum amount

  Correct Answer: D