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Amazon AWS Certified Developer - Associate Sample Questions (Q19-Q24):

NEW QUESTION # 19
An application stores images in an S3 bucket. Amazon S3 event notifications are used to trigger a Lambda function that resizes the images. Processing each image takes less than a second.
How will AWS Lambda handle the additional traffic?

• A. Lambda will scale out to execute the requests concurrently.
• B. Lambda will handle the requests sequentially in the order received.
• C. Lambda will process multiple images in a single execution.
• D. Lambda will add more compute to each execution to reduce processing time.

Answer: A
NEW QUESTION # 20
An e-commerce web application that shares session state on-premises is being migrated to AWS. The application must be fault tolerant, natively highly scalable, and any service interruption should not affect the user experience.
What is the best option to store the session state?

• A. Store the session state in Amazon CloudFront
• B. Enable session stickiness using elastic load balancers
• C. Store the session state in Amazon S3
• D. Store the session state in Amazon ElastiCache

Answer: D Explanation:
Explanation
https://aws.amazon.com/caching/session-management/
NEW QUESTION # 21
A developer is building an application. The application's front end is developed in JavaScript, and the data is stored in an Amazon DynamoDB table During testing, the application returns an HTTP 5xx error from the strongly consistent reads to the DynamoDB table; "Internal server error (Service: AmazonDynamoDBv2.
Status Code: 500; Error Code; InternalServerError)."
Which actions should the developer take to mitigate this error? (Select TWO )

• A. Retry the failed read requests with exponential backoff
• B. Configure DynamoDB auto scaling
• C. Avoid strongly consistent reads
• D. Use DynamoDB Accelerator (DAX)
• E. Increase read/write capacity of DynamoDB to meet the peak load.

Answer: A,C
NEW QUESTION # 22
A Developer is writing a mobile application that allows users to view images from an S3 bucket. The users must be able to log in with their Amazon login, as well as Facebook and/or Google accounts.
How can the Developer provide this authentication functionality?

• A. Use AWS IAM Access/Secret keys in the application code to allow Get*on the S3 bucket.
• B. Use AWS STS AssumeRole in the application code and assume a role with Get*permissions on the S3 bucket.
• C. Use Amazon Cognito with web identity federation.
• D. Use Amazon Cognito with SAML-based identity federation.

Answer: C Explanation:
Explanation/Reference: http://jayendrapatil.com/tag/iam-role/
NEW QUESTION # 23
A Developer has a stateful web server on-premises that is being migrated to AWS. The Developer must have greater elasticity in the new design.
How should the Developer re-factor the application to make it more elastic? (Choose two.)

• A. Use Amazon CloudFront with an Auto Scaling group
• B. Store session state data in an Amazon DynamoDB table
• C. Use an ELB with an Auto Scaling group
• D. Use Amazon CloudFront with an AWS Web Application Firewall
• E. Use pessimistic concurrency on Amazon DynamoDB

Answer: B,C
NEW QUESTION # 24
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