A distributed application includes an AWS Lambda function that runs successfully in the DEV environment with 128 MB of memory assigned. The same function is failing in the TEST environment. The developer is monitoring the application using AWS X-Ray, but the Lambda function cannot be seen on the X-Ray service graph. The Lambda execution role has AWS X-Ray permissions.
What is the MOST LIKELY cause for AWS X-Ray not showing any data for the Lambda function?

A. The AWS SDK needs to be included in the AWS Lambda deployment package.
B. VPC Flow Logs are not enabled for the application VPC.
C. Active tracing needs to be enabled for the Lambda function.
D. The memory needs to be increased to 2 GB for the TEST environments.

A company that manages movie reviews wants to make its movie review data available to its customers by calling a set of REST web service endpoints. The company will develop the retrieval functionality as AWS Lambda functions and will expose the functionality to customers as an Amazon API Gateway REST API.
The company needs to ensure that no consumer exceeds 100 requests a day to the API during the initial deployment. The company decides to use API Gateway API keys to restrict access. The company creates and issues API keys for each customer.
What should the company do next to meet these requirements with the LEAST administrative effort?

A. Create a usage plan that applies throttling at 100 requests a day. Associate the usage plan with the API keys of all customers.
B. Create an Amazon DynamoDB table to track all the requests that use a particular API key. For each request to the API, count the number of records in the DynamoDB table for that day for the API key. If the number of requests is 100 or greater, generate an exception.
C. Create a usage plan that applies a quota of 100 requests a day. Associate the usage plan with the API keys of all customers.
D. Create an Amazon Aurora table to track all the requests that use a particular API key. For each request to the API, count the number of records in the Aurora table for that day for the API key. If the number of requests is 100 or greater, generate an exception.

A company has a web application that is deployed on AWS. The application uses an Amazon API Gateway API and an AWS Lambda function as its backend.
The application recently demonstrated unexpected behavior. A developer examines the Lambda function code, finds an error, and modifies the code to resolve the problem. Before deploying the change to production, the developer needs to run tests to validate that the application operates properly.
The application has only a production environment available. The developer must create a new development environment to test the code changes. The developer must also prevent other developers from overwriting these changes during the test cycle.
Which combination of steps will meet these requirements with the LEAST development effort? (Choose two.)

A. Create a new resource in the current stage. Create a new method with Lambda proxy integration. Select the Lambda function. Add the hotfix alias. Redeploy the current stage. Test the backend.
B. Update the Lambda function in the API Gateway API integration request to use the hotfix alias. Deploy the API Gateway API to a new stage named hotfix. Test the backend.
C. Modify the Lambda function by fixing the code. Test the Lambda function. Create the alias hotfix. Point the alias to the $LATEST version.
D. Modify the Lambda function by fixing the code. Test the Lambda function. When the Lambda function is working as expected, publish the Lambda function as a new version. Create the alias hotfix. Point the alias to the new version.
E. Create a new API Gateway API for the development environment. Add a resource and method with Lambda integration. Choose the Lambda function and the hotfix alias. Deploy to a new stage. Test the backend.

A developer needs to build an AWS CloudFormation template that self-populates the AWS Region variable that deploys the CloudFormation template.
What is the MOST operationally efficient way to determine the Region in which the template is being deployed?

A. Use the AWS::Region pseudo parameter.
B. Require the Region as a CloudFormation parameter.
C. Find the Region from the AWS:StackId pseudo parameter by using the Fn::Split intrinsic function.
D. Dynamically import the Region by referencing the relevant parameter in AWS Systems Manager Parameter Store.

A developer created a web API that receives requests by using an internet-facing Application Load Balancer (ALB) with an HTTPS listener. The developer configures an Amazon Cognito user pool and wants to ensure that every request to the API is authenticated through Amazon Cognito.
What should the developer do to meet this requirement?

A. Add a listener rule to the listener to return a fixed response if the Authorization header is missing. Set the fixed response to 401 Unauthorized.
B. Create an authentication action for the listener rules of the ALB. Set the rule action type to authenticate- cognito. Set the OnUnauthenticatedRequest field to "deny."
C. Create an Amazon API Gateway API. Configure all API methods to be forwarded to the ALB endpoint. Create an authorizer of the COGNITO_USER_POOLS type. Configure every API method to use that authorizer.
D. Create a new target group that includes an AWS Lambda function target that validates the Authorization header by using Amazon Cognito. Associate the target group with the listener.

A company is using AWS CodePipeline to deliver one of its applications. The delivery pipeline is triggered by changes to the main branch of an AWS CodeCommit repository and uses AWS CodeBuild to implement the test and build stages of the process and AWS CodeDeploy to deploy the application.
The pipeline has been operating successfully for several months and there have been no modifications.
Following a recent change to the application's source code, AWS CodeDeploy has not deployed the updated application as expected.
What are the possible causes? (Choose two.)

A. The change was not made in the main branch of the AWS CodeCommit repository.
B. One of the earlier stages in the pipeline failed and the pipeline has terminated.
C. One of the Amazon EC2 instances in the company's AWS CodePipeline cluster is inactive.
D. The AWS CodePipeline is incorrectly configured and is not invoking AWS CodeDeploy.
E. AWS CodePipeline does not have permissions to access AWS CodeCommit.

A developer registered an AWS Lambda function as a target for an Application Load Balancer (ALB) using a CLI command. However, the Lambda function is not being invoked when the client sends requests through the ALB.
Why is the Lambda function not being invoked?

A. A Lambda function cannot be registered as a target for an ALB.
B. A Lambda function can be registered with an ALB using AWS Management Console only.
C. The permissions to invoke the Lambda function are missing.
D. Cross-zone is not enabled on the ALB.

A developer is writing an application that will run on Amazon EC2 instances in an Auto Scaling group. The developer wants to externalize the session state to support the application.
Which AWS services or resources can the developer use to meet these requirements? (Choose two.)

A. Amazon DynamoDB
B. Amazon Cognito
C. Amazon ElastiCache
D. Application Load Balancer
E. Amazon Simple Queue Service (Amazon SQS)

A development team is working on a mobile app that allows users to upload pictures to Amazon S3. The team expects the app will be used by hundreds of thousands of users during a single event simultaneously. Once the pictures are uploaded, the backend service will scan and parse the pictures for inappropriate content.
Which approach is the MOST resilient way to achieve this goal, which also smooths out temporary volume spikes for the backend service?

A. Develop an AWS Lambda function to check the upload folder in the S3 bucket. If new uploaded pictures are detected, the Lambda function will scan and parse them.
B. Once a picture is uploaded to Amazon S3, publish the event to an Amazon SQS queue. Use the queue as an event source to trigger an AWS Lambda function. In the Lambda function, scan and parse the picture.
C. When the user uploads a picture, invoke an API hosted in Amazon API Gateway. The API will invoke an AWS Lambda function to scan and parse the picture.
D. Create a state machine in AWS Step Functions to check the upload folder in the S3 bucket. If a new picture is detected, invoke an AWS Lambda function to scan and parse it.

A company manages a financial services application that stores a large volume of data in an Amazon DynamoDB table. A developer needs to improve the performance of the DynamoDB read queries without increasing the cost.
Which solution meets these requirements?

A. Use parallel scans.
B. Add a local secondary index (LSI).
C. Create a DynamoDB Accelerator (DAX) cluster.
D. Query with the ProjectionExpression parameter.