A Front-End Web Application Is Using Amazon Cognito User Pools

question 31

Multiple Choice

A front-end web application is using Amazon Cognito user pools to handle the user authentication flow. A developer is integrating Amazon DynamoDB into the application using the AWS SDK for JavaScript. How would the developer securely call the API without exposing the access or secret keys?

• A) Configure Amazon Cognito identity pools and exchange the JSON Web Token (JWT) for temporary credentials.
• B) Run the web application in an Amazon EC2 instance with the instance profile configured.
• C) Hardcore the credentials, use Amazon S3 to host the web application, and enable server-side encryption.
• D) Use Amazon Cognito user pool JSON Web Tokens (JWITs) to access the DynamoDB APIs.

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Definitions:

Black and White

A phrase often used to describe situations, thinking, or images that are clearly defined and without any grey areas or ambiguity.

Gestalt Principles

A theory of visual perception that emphasizes how people tend to organize visual elements into groups or unified wholes when certain principles are applied.

Months

Periods of time in the Gregorian calendar, each consisting of 28 to 31 days.

Size Constancy

A perceptual phenomenon where the perceived size of an object remains constant despite changes in its distance from the observer.