Question 1

An application under development is required to store hundreds of video files. The data must be encrypted within the application prior to storage, with a unique key for each video file.

How should the developer code the application?

Options :

A : Use the KMS Encrypt API to encrypt the data. Store the encrypted data key and data.

B : Use a cryptography library to generate an encryption key for the application. Use the encryption key to encrypt the data. Store the encrypted data.

C : Use the KMS GenerateDataKey API to get a data key. Encrypt the data with the data key. Store the encrypted data key and data.

D : Upload the data to an S3 bucket using server side-encryption with an AWS KMS key.

Answer: C

Question 2

A serverless application uses an AWS Lambda function to process Amazon S3 events. The Lambda function executes 20 times per second and takes 20 seconds to complete each execution.

How many concurrent executions will the Lambda function require?

Options :

A : 400

B : 5

C : 20

D : 40

Answer: A

Question 3

A company is running an application built on AWS Lambda functions. One Lambda function has performance issues when it has to download a 50 MB file from the internet every execution. This function is called multiple times a second.

What solution would give the BEST performance increase?

Options :

A : Put an Elastic Load Balancer in front of the Lambda function

B : Cache the file in the /tmp directory

C : Cache the file in Amazon S3

D : Increase the Lambda maximum execution time

Answer: B

Question 4

A Developer received the following error when attempting to launch an Amazon EC2 instance using the AWS CLI.

An error occurred (UnauthorizedOperation) when calling the RunInstances operation: You are not authorized to perform this operation. Encoded authorization failure message: VNVaHFdCohROkbyT_rIXoRyNTp7vXFJCqnGiwPuyKnsSVf-WSSGK_06H3vKnrkUa3qx5D40hqj9HEG8kznr04Acmi6lvc8m51tfqtsomFSDylK15x96ZrxMW7MjDJLrMkM0BasPvy8ixo1wi6X2b0C-J1ThyWU9IcrGd7WbaRDOiGbBhJtKs1z01WSn2rVa5_7sr5PwEK-ARrC9y5Pl54pmeF6wh7QhSv2pFO0y39WVBajL2GmByFmQ4p8s-6Lcgxy23b4NJdJwWOF4QGxK9HcKof1VTVZ2oIpsI-dH6_0t2DI0BTwaIgmaT7ldontI1p7OGz-3wPgXm67x2NVNgaK63zPxjYNbpl32QuXLKUKNlB9DdkSdoLvsuFIvf-lQOXLPHnZKCWMqrkI87eqKHYpYKyV5c11TIZTAJ3MntTGO_TJ4U9ySYvTzU2LgswYOtKF_O76-13fryGG5dhgOW5NxwCWBj6WT2NSJvqOeLykAFjR_ET4lM6Dl1XYfQITWCqIzlvlQdLmHJ1jqjp4gW56VcQCdqozLv2UAg8IdrZIXd0OJ047RQcvvN1IyZN0ElL7dR6RzAAQrftoKMRhZQng6THZs8PZM6wep6-yInzwfg8J5_FW6G_PwYqO-4VunVtJSTzM_F_8kojGlRmzqy7eCk5or__bIisUoslw

What action should the Developer perform to make this error more human-readable?

Options :

A : Use the AWS IAM decode-authorization-message API to decode this message

B : Make a call to AWS KMS to decode the message

C : Use the AWS STS decode-authorization-message API to decode the message

D : Use an open source decoding library to decode the message

Answer: C

Question 5

A developer uses an AWS Lambda function in an application to edit users' uploaded photos. The developer needs to update the Lambda function code and needs to test the updates.

For testing, the developer must divide the user traffic between the original version of the Lambda function and the new version of the Lambda function.

Which combination of steps will meet these requirements? (Choose two.)

Options :

A : Publish a version of the original Lambda function. Make the necessary changes to the Lambda code. Publish a new version of the Lambda function.

B : Use AWS CodeBuild to detect updates to the Lambda function. Configure CodeBuild to incrementally shift traffic from the original version of the Lambda function to the new version of the Lambda function.

C : Update the original version of the Lambda function to add a function URL. Make the necessary changes to the Lambda code. Publish another function URL for the updated Lambda code.

D : Create an alias that points to the original version of the Lambda function. Configure the alias to be a weighted alias that also includes the new version of the Lambda function. Divide traffic between the two versions.

E : Create an alias that points to the original function URL. Configure the alias to be a weighted alias that also includes the additional function URL. Divide traffic between the two function URLs.

Answer: A,D

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