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Amazon AWS Certified Developer - Associate Sample Questions (Q12-Q17):

NEW QUESTION # 12
A developer is creating an application that will be deployed on IoT devices. The application will send data to a RESTful API that is deployed as an AWS Lambda function. The application will assign each API request a unique identifier. The volume of API requests from the application can randomly increase at any given time of day.
During periods of request throttling, the application might need to retry requests. The API must be able to handle duplicate requests without inconsistencies or data loss.
Which solution will meet these requirements?

• A. Create an Amazon ElastiCache for Memcached instance. Store the unique identifier for each request in the cache. Modify the Lambda function to check the cache for the identifier before processing the request.
• B. Create an Amazon DynamoDB table. Store the unique identifier for each request in the table. Modify the Lambda function to return a client error response when the function receives a duplicate request.
• C. Create an Amazon RDS for MySQL DB instance. Store the unique identifier for each request in a database table. Modify the Lambda function to check the table for the identifier before processing the request.
• D. Create an Amazon DynamoDB table. Store the unique identifier for each request in the table. Modify the Lambda function to check the table for the identifier before processing the request.

Answer: D
NEW QUESTION # 13
A developer maintains an Amazon API Gateway REST API. Customers use the API through a frontend UI and Amazon Cognito authentication.
The developer has a new version of the API that contains new endpoints and backward-incompatible interface changes. The developer needs to provide beta access to other developers on the team without affecting customers.
Which solution will meet these requirements with the LEAST operational overhead?

• A. Define a development stage on the API Gateway API. Instruct the other developers to point the endpoints to the development stage.
• B. Specify new API Gateway endpoints for the API endpoints that the developer wants to add.
• C. Define a new API Gateway API that points to the new API application code. Instruct the other developers to point the endpoints to the new API.
• D. Implement a query parameter in the API application code that determines which code version to call.

Answer: A
NEW QUESTION # 14
A developer is creating a mobile app that calls a backend service by using an Amazon API Gateway REST API. For integration testing during the development phase, the developer wants to simulate different backend responses without invoking the backend service.
Which solution will meet these requirements with the LEAST operational overhead?

• A. Create an Amazon EC2 instance that serves the backend REST API by using an AWS CloudFormation template.
• B. Create an AWS Lambda function. Use API Gateway proxy integration to return constant HTTP responses.
• C. Customize the API Gateway stage to select a response type based on the request.
• D. Use a request mapping template to select the mock integration response.

Answer: A
NEW QUESTION # 15
A company is building a scalable data management solution by using AWS services to improve the speed and agility of development. The solution will ingest large volumes of data from various sources and will process this data through multiple business rules and transformations.
The solution requires business rules to run in sequence and to handle reprocessing of data if errors occur when the business rules run. The company needs the solution to be scalable and to require the least possible maintenance.
Which AWS service should the company use to manage and automate the orchestration of the data flows to meet these requirements?

• A. AWS Step Functions
• B. AWS Glue
• C. AWS Batch
• D. AWS Lambda

Answer: D
NEW QUESTION # 16
An application that is hosted on an Amazon EC2 instance needs access to files that are stored in an Amazon S3 bucket. The application lists the objects that are stored in the S3 bucket and displays a table to the user. During testing, a developer discovers that the application does not show any objects in the list.
What is the MOST secure way to resolve this issue?

• A. Update the IAM instance profile that is attached to the EC2 instance to include the S3:* permission for the S3 bucket.
• B. Update the developer's user permissions to include the S3:ListBucket permission for the S3 bucket.
• C. Update the S3 bucket policy by including the S3:ListBucket permission and by setting the Principal element to specify the account number of the EC2 instance.
• D. Update the IAM instance profile that is attached to the EC2 instance to include the S3:ListBucket permission for the S3 bucket.

Answer: D
NEW QUESTION # 17
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