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VCE
A global company has an application running on Amazon EC2 instances that serves image files from Amazon S3. User requests from the browser are causing high traffic, which results in degraded performance. Which optimization solution should a developer implement to increase application performance?
A. Create multiple prefixes in the S3 bucket to increase the request rate.
B. Create an Amazon ElastiCache cluster to cache and serve frequently accessed items.
C. Use Amazon CloudFront to serve the content of images stored in Amazon S3.
D. Submit a ticket to AWS Support to request a rate limit increase for the S3 bucket.
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 Amazon Cognito identity pool, configure the Amazon Cognito Authorizer in API Gateway, and use the temporary credentials generated by the identity pool
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 user pool, configure the Cognito Authorizer in API Gateway, and use the identity or access token
D. Create an IAM user for each API user, attach an invoke permissions policy to the API. and use an IAM authorizer in API Gateway.
A developer at a company writes an AWS ClojdForination template. The template refers to subnets that were created by a separate AWS Cloud Formation template that the company's network team wrote. When the developer attempts to launch the stack for the first time, the launch fails.
Which template coding mistakes could have caused this failure? (Select TWO.)
A. The developer's template does not use the Ref intrinsic function to refer to the subnets
B. The developer's template does not use the ImportValue intrinsic function to refer to the subnets
C. The Mappings section of the developer's template does not refer to the subnets.
D. The network team's template does not export the subnets in the Outputs section
E. The network team's template does not export the subnets in the Mappings section