Which of the following services are key/value stores? Choose 3 answers

• A.DynamoDB
• B.Simple Workflow Service
• C.Amazon ElastiCache
• D.Simple Notification Service
• E.Simple Storage Service

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A developer is troubleshooting a three-tier application, which is deployed on Amazon EC2 instances. There is a connectivity problem between the application servers and the database servers.
Which AWS services or tools should be used to identify the faulty component? (Select TWO.)

• A.AWS Trusted Advisor
• B.AWS Config rules
• C.Network access control lists
• D.Amazon VPC Flow Logs
• E.AWS CloudTrail.

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A developer has written an Amazon kinesis Data streams application. As usage grows and traffic over time, the application is regularly receiving provisionedThroughputExceededException error messages.
Which steps should the Developer take to resolve the error? (Select Two.)

• A.Implement exponential backoff on the GetRecords call and the PutRecords call.
• B.Increase the delay between the GetRecords call and the PutRecords call.
• C.Use Auto scaling to scale the stream for better performance.
• D.Increase the number of shards in the data stream.
• E.Specify a shard iterator using the shardlterator parameter.

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A Developer is creating a mobile application with a limited budget. The solution requires a scalable service that will enable customers to sign up and authenticate into the mobile application while using the organization's current SAML 2.0 identity provider.
Which AWS service should be used to meet these requirements?

• A.AWS Lambda
• B.Amazon EC2
• C.AWS IAM
• D.Amazon Cognito

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An application overwrites an object in Amazon S3, and then immediately reads the same object. Why would the application sometimes retrieve the old version of the object?

• A.All S3 PUTS are eventually consistent, so the application may read the old object.
• B.S3 overwrite PUTS are eventually consistent, so the application may read the old object.
• C.The application needs to explicitly specify latest version when retrieving the object.
• D.The application needs to add extra metadata to label the latest version when uploading to Amazon S3.

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