A developer has built a market application that stores pricing data in Amazon DynamoDB with Amazon ElastiCache in front. The prices of items in the market change frequently Sellers have begun complaining that, after they update the price of an item, the price does not actually change in the product listing
What could be causing this issue?

• A.The cache is not being invalidated when the price of the item is changed
• B.The DynamoDB table was provisioned with insufficient read capacity
• C.The price of the item is being retrieved using a write-through ElastiCache cluster
• D.The DynamoDB table was provisioned with insufficient write capacity.

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A developer has launched an application that calls an API by way of Amazon API Gateway. It offers information that changes several times a day, but is not updated in real time. The application has become so popular that the API endpoint is overloaded and that traffic to the endpoint must be reduced.
What can the developer do to address the performance issues?

• A.Enable an Auto Scaling group on the endpoint service and database.
• B.Enable API caching in Amazon ElastiCache.
• C.Create an additional API Gateway and use an Application Load Balancer

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A developer wants to modify the following AWS Cloud Formation template to embed another CloudFormation stack:

Which syntax should the developer add to the blank line of the CloudFormation template to meet this requirement?

• A."Mapping" : "AWS::CloudFormation::Stack",
• B."Type" : "AWS;:CloudFcrmation::NestedStack",
• C."Type" : "AWS::CloudFormation::Stack",
• D."Mapping" : "AWS::CloudFormation::NestedStack",

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A developer is attempting to use the Amazon S3 PutObject API operation to upload an object to an S3 bucket that has default encryption enabled. The developer receives a 400 Bad Request error.
What is the MOST likely cause of this error?

• A.The S3 bucket exceeds the maximum storage capacity that is allowed
• B.The API operation cannot access the encryption key
• C.The HTTP Content-Length header is missing.
• D.The object exceeds the maximum object size that is allowed.

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A developer is creating a new application that will be accessed by users through an API created using Amazon API Gateway The users need to be authenticated by a third-party Security Assertion Markup Language (SAML) identity provider Once authenticated, users will need access to other AWS services such as Amazon S3 and Amazon DynamoDB How can these requirements be met?

• A.Use Amazon CloudFront signed URLs to connect with the SAML identity provider
• B.Use an Amazon Cognito user pool with SAML as the resource server
• C.Use the AWS IAM service to provide the sign-up and sign-in functionality.
• D.Use Amazon Cognito Identity pools with a SAML identity provider as one of the authentication providers

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