A developer wants to build an application that will allow new users to register and create new user accounts. The application must also allow users with social media accounts to log in using their social media credentials.
Which AWS service or feature can be used to meet these requirements'?

• A.AWS IAM
• B.Amazon Cognito identity pools
• C.Amazon Cognito user pools
• D.AWS Directory Service

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A company has an internet-facing application that uses Web Identity Federation to obtain a temporary credential from AWS Security Token Service (AWS STS). The app then uses the token to access AWS services.
Review the following response:

Based on the response displayed what permissions are associated with the call from the application?

• A.Permissions associated with the default role used when the AWS service was built
• B.Permissions associated with the role AROACLKWSDQRAOEXAMPLE:app1
• C.Permissions associated with the account that owns the AWS service
• D.Permission associated with the IAM principal that owns the AccessKeyID ASgeIAIOSFODNN7EXAMPLE

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A company is developing an application that will be accessed through the Amazon API Gateway REST API Registered users should be the only ones who can access certain resources of this API. The token being used should expire automatically and needs to be refreshed periodically.
How can a developer meet these requirements'?

• A.Create an IAM user for each API user, attach an invoke permissions policy to the API. and use an IAM authorizer in API Gateway.
• B.Create and maintain a database record for each user with a corresponding token and use an AWS Lambda authorizer m API Gateway
• C.Create an Amazon Cognito identity pool, configure the Amazon Cognito Authorizer in API Gateway, and use the temporary credentials generated by the identity pool
• D.Create an Amazon Cognito user pool, configure the Cognito Authorizer in API Gateway, and use the identity or access token

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A Developer is building a mobile application and needs any update to user profile data to be pushed to all devices accessing the specific identity. The Developer does not want to manage a back end to maintain the user profile data.
What is the MOST efficient way for the Developer to achieve these requirements using Amazon Cognito?

• A.Use Cognito federated identities.
• B.Use a Cognito user pool.
• C.Use Cognito Sync.
• D.Use Cognito events.

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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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