A company developed an API application on AWS by using Amazon CloudFront. Amazon API Gateway, and AWS Lambda. The API has a minimum of four requests every second A developer notices that many API users run the same query by using the POST method. The developer wants to cache the POST request to optimize the API resources.
Which solution will meet these requirements'?

1. A. Configure the CloudFront cache Update the application to return cached content based upon the default request headers.
2. B. Override the cache method in me selected stage of API Gateway Select the POST method.
3. C. Save the latest request response in Lambda /tmp directory Update the Lambda function to check the /tmp directory
4. D. Save the latest request m AWS Systems Manager Parameter Store Modify the Lambda function to take the latest request response from Parameter Store

Correct Answer: A
This solution will meet the requirements by using Amazon CloudFront, which is a content delivery network (CDN) service that speeds up the delivery of web content and APIs to end users. The developer can configure the CloudFront cache, which is a set of edge locations that store copies of popular or recently accessed content close to the viewers. The developer can also update the application to return cached content based upon the default request headers, which are a set of HTTP headers that CloudFront automatically forwards to the origin server and uses to determine whether an object in an edge location is still valid. By caching the POST requests, the developer can optimize the API resources and reduce the latency for repeated queries. Option B is not optimal because it will override the cache method in the selected stage of API Gateway, which is not possible or effective as API Gateway does not support caching for POST methods by default. Option C is not optimal because it will save the latest request response in Lambda /tmp directory, which is a local storage space that is available for each Lambda function invocation, not a cache that can be shared across multiple invocations or requests. Option D is not optimal because it will save the latest request in AWS Systems Manager Parameter Store, which is a service that provides secure and scalable storage for configuration data and secrets, not a cache for API responses.
References: [Amazon CloudFront], [Caching Content Based on Request Headers]

A company wants to deploy and maintain static websites on AWS. Each website's source code is hosted in one of several version control systems, including AWS CodeCommit, Bitbucket, and GitHub.
The company wants to implement phased releases by using development, staging, user acceptance testing, and production environments in the AWS Cloud. Deployments to each environment must be started by code merges on the relevant Git branch. The company wants to use HTTPS for all data exchange. The company needs a solution that does not require servers to run continuously.
Which solution will meet these requirements with the LEAST operational overhead?

1. A. Host each website by using AWS Amplify with a serverless backen
2. B. Conned the repository branches that correspond to each of the desired environment
3. C. Start deployments by merging code changes to a desired branch.
4. D. Host each website in AWS Elastic Beanstalk with multiple environment
5. E. Use the EB CLI to link each repository branc
6. F. Integrate AWS CodePipeline to automate deployments from version control code merges.
7. G. Host each website in different Amazon S3 buckets for each environmen
8. H. Configure AWS CodePipeline to pull source code from version contro
9. I. Add an AWS CodeBuild stage to copy source code to Amazon S3.
10. J. Host each website on its own Amazon EC2 instanc
11. K. Write a custom deployment script to bundle each website's static asset
12. L. Copy the assets to Amazon EC2. Set up a workflow to run the script when code is merged.

Correct Answer: A
AWS Amplify is a set of tools and services that enables developers to build and deploy full-stack web and mobile applications that are powered by AWS. AWS Amplify supports hosting static websites on Amazon S3 and Amazon CloudFront, with HTTPS enabled by default. AWS Amplify also integrates with various version control systems, such as AWS CodeCommit, Bitbucket, and GitHub, and allows developers to connect different branches to different environments. AWS Amplify automatically builds and deploys the website whenever code changes are merged to a connected branch, enabling phased releases with minimal operational overhead. Reference: AWS Amplify Console

A company is planning to securely manage one-time fixed license keys in AWS. The company's development team needs to access the license keys in automaton scripts that run in Amazon EC2 instances and in AWS CloudFormation stacks.
Which solution will meet these requirements MOST cost-effectively?

1. A. Amazon S3 with encrypted files prefixed with “config”
2. B. AWS Secrets Manager secrets with a tag that is named SecretString
3. C. AWS Systems Manager Parameter Store SecureString parameters
4. D. CloudFormation NoEcho parameters

Correct Answer: C
AWS Systems Manager Parameter Store is a service that provides secure, hierarchical storage for configuration data and secrets. Parameter Store supports SecureString parameters, which are encrypted using AWS Key Management Service (AWS KMS) keys. SecureString parameters can be used to store license keys in AWS and retrieve them securely from automation scripts that run in EC2 instances or CloudFormation stacks. Parameter Store is a cost-effective solution because it does not charge for storing parameters or API calls. Reference: Working with Systems Manager parameters

A company runs a batch processing application by using AWS Lambda functions and Amazon API Gateway APIs with deployment stages for development, user acceptance testing and production A development team needs to configure the APIs in the deployment stages to connect to third-party service endpoints.
Which solution will meet this requirement?

1. A. Store the third-party service endpoints in Lambda layers that correspond to the stage
2. B. Store the third-party service endpoints in API Gateway stage variables that correspond to the stage
3. C. Encode the third-party service endpoints as query parameters in the API Gateway request URL.
4. D. Store the third-party service endpoint for each environment in AWS AppConfig

Correct Answer: B
API Gateway stage variables are name-value pairs that can be defined as configuration attributes associated with a deployment stage of a REST API. They act like environment variables and can be used in the API setup and mapping templates. For example, the development team can define a stage variable named endpoint and assign it different values for each stage, such as dev.example.com for development, uat.example.com for user acceptance testing, and prod.example.com for production. Then, the team can use the stage variable value in the integration request URL, such as http://$ { stageVariables.endpoint}/api. This way, the team can use the same API setup with different endpoints at each stage by resetting the stage variable value. The other solutions are either not feasible or not cost-effective. Lambda layers are used to package and load dependencies for Lambda functions, not for storing endpoints. Encoding the endpoints as query parameters would expose them to the public and make the request URL unnecessarily long. Storing the endpoints in AWS AppConfig would incur additional costsand complexity, and would require additional logic to retrieve the values from the configuration store. References
✑ Using Amazon API Gateway stage variables
✑ Setting up stage variables for a REST API deployment
✑ Setting stage variables using the Amazon API Gateway console

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
The solution that will meet the requirements is to add a test phase to the amplify.yml build settings for the application. This way, the developer can run end-to-end tests on every code commit and catch any bugs before deploying to production. The other options either do not support end-to-end testing, or do not run tests automatically.
Reference: End-to-end testing