A Developer created a new AWS account and must create a scalable AWS Lambda function that meets the following requirements for concurrent execution:
Average execution time of 100 seconds 50 requests per second Which step must be taken prior to deployment to prevent errors?
A. Implement dead-letter queues to capture invocation errors
B. Add an event source from Amazon API Gateway to the Lambda function
C. Implement error handling within the application code
D. Contact AWS Support to increase the concurrent execution limits
A company is developing an application that will run on several Amazon EC2 instances in an Auto Scaling group and can access a database running on Amazon EC2. The application needs to store secrets required to connect to the database. The application must allow for periodic secret rotation, and there should be no changes to the application when a secret changes.
What is the SAFEST way to meet these requirements?
A. Associate an IAM role to the EC2 instance where the application is running with permission to access the database.
B. Use AWS Systems Manager Parameter Store with the SecureString data type to store secrets.
C. Configure the application to store secrets in Amazon S3 object metadata.
D. Hard code the database secrets in the application code itself.
A company is migrating its on-premises database to Amazon RDS for MySQL. The company has read-heavy workloads, and wants to make sure it re-factors its code to achieve optimum read performance for its queries. How can this objective be met?
A. Add database retries to effectively use RDS with vertical scaling
B. Use RDS with multi-AZ deployment
C. Add a connection string to use an RDS read replica for read queries
D. Add a connection string to use a read replica on an EC2 instance.
A developer implemented a static website hosted in Amazon S3 that makes web service requests in Amazon API Gateway and AWS Lambda. The site is showing an error that reads. ''No 'Access Control-Allow-Origin'header' header is present on the requested resource. Origin 'null is therefore not allowed access '' What should the Developer do to resolve this issue?
A. Enable cross-origin resource sharing (CORS) on the S3 bucket
B. Enable cross-origin resource sharing (CORS) for the method in API Gateway
C. Add the Access Control-Request-Method header to the request
D. Add the Access-Control Inquest Headers header to the request
Games-R-Us is launching a new game app for mobile devices. Users will log into the game using their existing Facebook account and the game will record player data and scoring information directly to a DynamoDB table. What is the most secure approach for signing requests to the DynamoDB API?
A. Create an IAM user with access credentials that are distributed with the mobile app to sign the requests
B. Distribute the AWS root account access credentials with the mobile app to sign the requests
C. Request temporary security credentials using web identity federation to sign the requests
D. Establish cross account access between the mobile app and the DynamoDB table to sign the requests
A company maintains an application responsible for processing several thousand external callbacks each day. The company's System administrators want to know how many callbacks are being received on a rolling basis, and they want this data available for 10 days. The company also wants the ability to issue automated alerts if the number of callbacks exceeds the defined thresholds.
What is the MOST cost-effective way to address the need to track and alert on these statistics?
A. Push callback data to an Amazon RDS database that can be queried to show historical data and to alert on exceeded thresholds.
B. Push callback data to AWS X-Ray and use AWS Lambda to query, display, and alert on exceeded thresholds.
C. Push callback data to Amazon Kinesis Data Streams and invoke an AWS Lambda function that stores data in Amazon DynamoDB and sends the required alerts.
D. Push callback data to Amazon CloudWatch as a custom metric and use the CloudWatch alerting mechanisms to alert System Administrators.
A company has three different environments: Development, QA, and Production. The company wants to deploy its code first in the Development environment, then QA, and then Production. Which AWS service can be used to meet this requirement?
A. Use AWS CodeCommit to create multiple repositories to deploy the application.
B. Use AWS CodeBuild to create, configure, and deploy multiple build application projects.
C. Use AWS Data Pipeline to create multiple data pipeline provisions to deploy the application.
D. Use AWS CodeDeploy to create multiple deployment groups.
A developer has written an application that runs on Amazon EC2 instances and generates a value every minute. The Developer wants to monitor and graph the values generated over time without logging in to the instance each time. Which approach should the Developer use to achieve this goal?
A. Use the Amazon CloudWatch metrics reported by default for all EC2 instances View each value from the CloudWatch console.
B. Develop the application to store each value in a file on Amazon S3 every minute with the Umestamp as the name
C. Publish each generated value as a custom metric to Amazon CloudWatch using available AWS SDKs
D. Store each value as a variable and add the variable to the list of EC2 metrics that should be reported to the Amazon CloudWatch console
When using a large Scan operation in DynamoDB, what technique can be used to minimize the impact of a scan on a table's provisioned throughput?
A. Set a smaller page size for the scan
B. Use parallel scans
C. Define a range index on the table
D. Prewarm the table by updating all items
A game stores user game data in an Amazon DynamoDB table. Individual users should not have access to other users' game data. How can this be accomplished?
A. Encrypt the game data with individual user keys.
B. Restrict access to specific items based on certain primary key values.
C. Stage data in SQS queues to inject metadata before accessing DynamoDB.
D. Read records from DynamoDB and discard irrelevant data client-side.
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