An e-commerce site allows returning users to log in to display customized web pages. The workflow is shown in the image below:

An application is running on EC2 instances. Amazon RDS is used for the database that stores user accounts and preferences. The website freezes or is slow to load while waiting for the login step to complete. The remaining components of the site are well-optimized.
Which of the following techniques will resolve this issue? (Select Two.)

• A.Implement the user login page as an asynchronous Lambda function.
• B.Use Amazon ElastiCache for MemCached to cache user data.
• C.Use Amazon Application Load Balancer to load balance the traffic to the website.
• D.Call the database asynchronously so the code can continue executing.
• E.Batch login requests from hundreds of users together as a single read request to the database.

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A company is running an application built on AWS Lambda functions. One Lambda function has performance issues when it has to download a 50MB file from the Internet in every execution. This function is called multiple times a second.
What solution would give the BEST performance increase?

• A.Cache the file in the /tmp directory
• B.Increase the Lambda maximum execution time
• C.Put an Elastic Load Balancer in front of the Lambda function
• D.Cache the file in Amazon S3

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A company has a three-tier application that is deployed in Amazon Elastic Container Service (Amazon ECS). The application is using an Amazon RDS for MySQL DB Instance The application performs more database reads than writes.
During times of peak usage. the application's performance degrades. When this performance degradation occurs, the DB instance's ReadLatency metric in Amazon CloudWatch increases suddenly How should a developer modify the application to improve performance?

• A.Use Amazon ElastiCache to cache query results
• B.Add read capacity units (RCUs) to the DB instance.
• C.Scale the ECS cluster to contain more ECS instances
• D.Modify the ECS task definition to increase the task memory

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A Developer is testing a Docker-based application that uses the AWS SDK to interact with Amazon DynamoDB. In the local development environment, the application has used IAM access keys. The application is now ready for deployment onto an ECS cluster.
How should the application authenticate with AWS services in production?

• A.Configure an ECS task IAM role for the application to use
• B.Refactor the application to call AWS STS AssumeRole based on an instance role
• C.Configure AWS access key/secret access key environment variables with new credentials
• D.Configure the credentials file with a new access key/secret access key

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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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