A social media company is using Amazon Cognito in order to synchronize profiles across different mobile devices, to enable end users to have a seamless experience.
Which of the following configurations can be used to silently notify users whenever an update is available on all other devices?

• A.Use the SyncCallback interface to receive notifications on the application.
• B.Use an Amazon Cognito stream to analyze the data and push the notifications.
• C.Modify the user pool to include all the devices which keep them in sync.
• D.Use the push synchronization feature with the appropriate IAM role.

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A developer is writing an application that stores data in an Amazon DynamoDB table by using the Putltem API operation. The table has a partition key of streamlD and has a sort key of seqlD. The developer needs to make sure that the Putltem invocation does not overwrite the existing partition key and sort key.
Which condition expression will maintain the uniqueness of the partition key and the sort key?
A)

B)

C)

D)

• A.Option A
• B.Option B
• C.Option C
• D.Option D

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A Developer created a Lambda function for a web application backend. When testing the Lambda function from the AWS Lambda console, the Developer can see that the function is being executed, but there is no log data being generated in Amazon CloudWatch Logs, even after several minutes.
What could cause this situation?

• A.The Lambda function does not have any explicit log statements for the log data to send it to CloudWatch Logs.
• B.The Lambda function is missing CloudWatch Logs as a source trigger to send log data.
• C.The execution role for the Lambda function is missing permissions to write log data to the CloudWatch Logs.
• D.The Lambda function is missing a target CloudWatch Log group.

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A Developer is writing an application that runs on Amazon EC2 instances in an Auto scaling group. The application data is stored in an Amazon DynamoDB table and records are constantly updated by all instances. An instance sometimes retrieves old dat a. The Developer wants to correct this by making sure the reads are strongly consistent.
How can the developer accomplish this?

• A.Set consistentRead to true when calling Getitem.
• B.Create a new DynamoDB Accelerator (DAX) table.
• C.Set consistency to strong when calling Update Table.
• D.Use the Getshardlterator command.

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A Developer wants to encrypt new objects that are being uploaded to an Amazon S3 bucket by an application. There must be an audit trail of who has used the key during this process. There should be no change to the performance of the application.
Which type of encryption meets these requirements?

• A.Server-side encryption using S3-managed keys
• B.Client-side encryption with a client-side symmetric master key
• C.Client-side encryption with AWS KMS-managed keys
• D.Server-side encryption with AWS KMS-managed keys

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