A Machine Learning Specialist is applying a linear least squares regression model to a dataset with 1,000 records and 50 features.Prior to training, the MLSpecialist notices that two features are perfectly linearly dependent.Why could this be an issue for the linear least squares regression model?Read More →
A medical records company is hosting an application on Amazon EC2 instances.The application processes customer data files that are stored on Amazon S3.The EC2 instances are hosted in public subnets.The EC2 instances access Amazon S3 over the Internet, but they do not require any other network access.A new requirement mandates that the network traffic for file transfers take a private route and not be sent over the Internet.Which change to the network architecture should a solutions architect recommend to meet this requirement?Read More →
A company has a Microsoft SQL Server 2017 Enterprise edition on Amazon RDS database with the Multi-AZ option turned on.Automatic backups are turned on and the retention period is set to 7 days.The company needs to add a read replica to the RDS DB instance.How should a database specialist achieve this task?Read More →
A social media application uses the AWS SDK for JavaScript on the frontend to get user credentials from AWS Security Token Service (AWS STS).The application stores its assets in an Amazon S3 bucket.The application serves its content by using an Amazon CloudFront distribution with the origin set to the S3 bucket.The credentials for the role that the application assumes to make the SDK calls are stored in plaintext in a JSON file within the application code.The developer needs to implement a solution that will allow the application to get user credentials without having any credentials hardcoded in the application code.Which solution will meet these requirements?Read More →
A company runs an application for multiple environments in a single AWS account.An AWS CodePipeline pipeline uses a development Amazon Elastic Container Service (Amazon ECS) cluster to test an image for the application from an Amazon Elastic Container Registry (Amazon ECR) repository.The pipeline promotes the image to a production ECS cluster.The company needs to move the production cluster into a separate AWS account in the same AWS Region.The production cluster must be able to download the images over a private connection.Which solution will meet these requirements?Read More →
A company has an application that uses an Amazon RDS for MariaDB Multi-AZ database.The application becomes unavailable for several minutes every time the database experiences a failover during a planned maintenance event.What should a SysOps administrator do to reduce the downtime of the application during failover?Read More →
A company wants to use Amazon S3 to back up its on-premises file storage solution.The company’s on-premises file storage solution supports NFS, and the company wants its new solution to support NFS.The company wants to archive the backup files after 5 days.If the company needs archived files for disaster recovery, the company is willing to wait a few days for the retrieval of those files.Which solution meets these requirements MOST cost-effectively?Read More →
A security engineer configures Amazon S3 Cross-Region Replication (CRR) for all objects that are in an S3 bucket in the us-east-1 Region.Some objects in this S3 bucket use server-side encryption with AWS KMS keys (SSE-KMS) for encryption at rest.The security engineer creates a destination S3 bucket in the us-west-2 Region.The destination S3 bucket is in the same AWS account as the source S3 bucket.The security engineer also creates a customer managed key in us-west-2 to encrypt objects at rest in the destination S3 bucket.The replication configuration is set to use the key in us-west-2 to encrypt objects in the destination S3 bucket.The security engineer has provided the S3 replication configuration with an IAM role to perform the replication in Amazon S3.After a day, the security engineer notices that no encrypted objects from the source S3 bucket are replicated to the destination S3 bucket.However, all the unencrypted objects are replicated.Which combination of steps should the security engineer take to remediate this issue? (Choose three.)Read More →
A company has developed a non-production application that is composed of multiple microservices for each of the company’s business units.A single development team maintains all the microservices.The current architecture uses a static web frontend and a Java-based backend that contains the application logic.The architecture also uses a MySQL database that the company hosts on an Amazon EC2 instance.The company needs to ensure that the application is secure and available globally.Which solution will meet these requirements with the LEAST operational overhead?Read More →
A company is migrating an on-premises application and a MySQL database to AWS.The application processes highly sensitive data, and new data is constantly updated in the database.The data must not be transferred over the internet.The company also must encrypt the data in transit and at rest.The database is 5 TB in size.The company already has created the database schema in an Amazon RDS for MySQL DB instance.The company has set up a 1 Gbps AWS Direct Connect connection to AWS.The company also has set up a public VIF and a private VIF.A solutions architect needs to design a solution that will migrate the data to AWS with the least possible downtime.Which solution will meet these requirements?Read More →
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