An application writes items to an Amazon DynamoDB table. As the application scales to thousands of instances, calls to the DynamoDB API generate occasional ThrottlingException errors. The application is coded in a language incompatible with the AWS SDK.
How should the error be handled?

• A.Add exponential backoff to the application logic
• B.Use Amazon SQS as an API message bus
• C.Pass API calls through Amazon API Gateway
• D.Send the items to DynamoDB through Amazon Kinesis Data Firehose

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An application needs to use the IP address of the client in its processing. The application has been moved into AWS and has been placed behind an Application Load Balancer (ALB). However, all the client IP addresses now appear to be the same. The application must maintain the ability to scale horizontally.
Based on this scenario, what is the MOST cost-effective solution to this problem?

• A.Alter the application code to inspect a custom header. Alter the client code to pass the IP address in the custom header.
• B.Remove the application from the ALB. Delete the ALB and change Amazon Route 53 to direct traffic to the instance running the application.
• C.Remove the application from the ALB. Create a Classic Load Balancer in its place. Direct traffic to the application using the HTTP protocol.
• D.Alter the application code to inspect the X-Forwarded-For header. Ensure that the code can work properly if a list of IP addresses is passed in the header.

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A Developer is building a mobile application and needs any update to user profile data to be pushed to all devices accessing the specific identity. The Developer does not want to manage a back end to maintain the user profile data.
What is the MOST efficient way for the Developer to achieve these requirements using Amazon Cognito?

• A.Use Cognito federated identities.
• B.Use Cognito Sync.
• C.Use Cognito events.
• D.Use a Cognito user pool.

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A company recently migrated its web, application and NoSQL database tiers to AWS. The company is using Auto Scaling to scale the web and application tiers. More than 95 percent of the Amazon DynamoDB requests are repeated read-requests.
How can the DynamoDB NoSQL tier be scaled up to cache these repeated requests?

• A.Amazon SQS
• B.Amazon CloudFront
• C.Amazon DynamoDB Accelerator
• D.Amazon EMR

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A team of Developers must migrate an application running inside an AWS Elastic Beanstalk environment from a Classic Load Balancer to an Application Load Balancer.
Which steps should be taken to accomplish the task using the AWS Management Console?

• A.1. Update the application code in the existing deployment.
  2. Select a new load balancer type before running the deployment.
  3. Deploy the new version of the application code to the environment.
• B.1. Create a new environment with the same configurations except for the load balancer type.
  2. Deploy the same application version as used in the original environment.
  3. Run the swap-environment-cnames action.
• C.1. Clone the existing environment, changing the associated load balancer type.
  2. Deploy the same application version as used in the original environment.
  3. Run the swap-environment-cnames action.
• D.1. Edit the environment definitions in the existing deployment.
  2. Change the associated load balancer type according to the requirements.
  3. Rebuild the environment with the new load balancer type.

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