A developer is developing an application that uses signed requests (Signature Version 4) to call other AWS services The developer has created a canonical request, has created the string to sign, and has calculated signing information Which methods could the developer use to complete a signed request? (Select TWO)

• A.Add the signature to a session cookie
• B.Add the signature to an HTTP header that 15 named Authentication
• C.Add the signature to an HTTP header that is named WWW-Authenticate
• D.Add the signature to a query string parameter that is named X-Amz-Signature
• E.Add the signature to an HTTP header that is named Authorization

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A Developer wants to find a list of items in a global secondary index from an Amazon DynamoDB table.
Which DynamoDB API call can the Developer use in order to consume the LEAST number of read capacity units?

• A.Scan operation using eventually-consistent reads
• B.Query operation using strongly-consistent reads
• C.Query operation using eventually-consistent reads
• D.Scan operation using strongly-consistent reads

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A company is using AWS CodeBuild to compile a website from source code stored in AWS CodeCommit. A recent change to the source code has resulted in the CodeBuild project being unable to successfully compile the website.
How should the Developer identify the cause of the failures?

• A.Manually re-run the build process on a local machine so that the output can be visualized.
• B.Use a custom Docker image that includes the AWS X-Ray agent in the AWS CodeBuild project configuration.
• C.Check the build logs of the failed phase in the last build attempt in the AWS CodeBuild project build history.
• D.Modify the buildspec.yml file to include steps to send the output of build commands to Amazon
  CloudWatch.

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A developer works in an environment with multiple AWS accounts that have AWS Lambda functions processing the same 100 KB payloads. The developer wants to centralize the point of origin of the payloads to one account and have all the Lambda functions be invoked whenever the initiating event occurs in the parent account.
How can the developer design the workflow in the MOST efficient way, so all the multi-account Lambda functions get invoked when the event occurs?

• A.Create a Lambda function in the parent account and use cross-account IAM roles with the AWS Security Token Service (AWS STS) AssumeRole API call to make AWS Lambda invoke the API call to invoke all the cross-account Lambda functions.
• B.Subscribe all the multi-account Lambda functions to an Amazon SNS topic and make a SNS Publish API call with the payload to the SNS topic.
• C.Set up an Amazon SQS queue with the queue policy permitting the ReceiveMessage action for multi-account Lambda functions. Then send the payload to the SQS queue using the sqs:SendMessage permission and poll the queue using multi-account Lambda functions.
• D.Use a worker on an Amazon EC2 instance to poll for the payload event. Invoke all Lambda functions using the Lambda Invoke API after using cross-account IAM roles with the AWS Security Token Service (AWS STS) AssumeRole API call.

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

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