A developer is creating an application that will store personal health information (PHI). The PHI needs to be encrypted at all times. An encrypted Amazon RDS for MySQL DB instance is storing the data. The developer wants to increase the performance of the application by caching frequently accessed data while adding the ability to sort or rank the cached datasets.
Which solution will meet these requirements?

1. A. Create an Amazon ElastiCache for Redis instanc
2. B. Enable encryption of data in transit and at res
3. C. Store frequently accessed data in the cache.
4. D. Create an Amazon ElastiCache for Memcached instanc
5. E. Enable encryption of data in transit and at rest.Store frequently accessed data in the cache.
6. F. Create an Amazon RDS for MySQL read replic
7. G. Connect to the read replica by using SS
8. H. Configure the read replica to store frequently accessed data.
9. I. Create an Amazon DynamoDB table and a DynamoDB Accelerator (DAX) cluster for the tabl
10. J. Store frequently accessed data in the DynamoDB table.

Correct Answer: A

A developer has an application that makes batch requests directly to Amazon DynamoDB by using the BatchGetItem low-level API operation. The responses frequently return values in the UnprocessedKeys element.
Which actions should the developer take to increase the resiliency of the application when the batch response includes values in UnprocessedKeys? (Choose two.)

1. A. Retry the batch operation immediately.
2. B. Retry the batch operation with exponential backoff and randomized delay.
3. C. Update the application to use an AWS software development kit (AWS SDK) to make the requests.
4. D. Increase the provisioned read capacity of the DynamoDB tables that the operation accesses.
5. E. Increase the provisioned write capacity of the DynamoDB tables that the operation accesses.

Correct Answer: BD

A developer is using AWS Amplify Hosting to build and deploy an application. The developer is receiving an increased number of bug reports from users. The developer wants to add end-to-end testing to the application to eliminate as many bugs as possible before the bugs reach production.
Which solution should the developer implement to meet these requirements?

1. A. Run the amplify add test command in the Amplify CLI.
2. B. Create unit tests in the applicatio
3. C. Deploy the unit tests by using the amplify push command in the Amplify CLI.
4. D. Add a test phase to the amplify.yml build settings for the application.
5. E. Add a test phase to the aws-exports.js file for the application.

Correct Answer: C

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 is offering APIs as a service over the internet to provide unauthenticated read access to statistical information that is updated daily. The company uses Amazon API Gateway and AWS Lambda to develop the APIs. The service has become popular, and the company wants to enhance the responsiveness of the APIs.
Which action can help the company achieve this goal?

1. A. Enable API caching in API Gateway.
2. B. Configure API Gateway to use an interface VPC endpoint.
3. C. Enable cross-origin resource sharing (CORS) for the APIs.
4. D. Configure usage plans and API keys in API Gateway.

Correct Answer: A