Q248.A solutions architect is designing a web application on AWS that requires 99.99% availability. The application will consist of a three-tier architecture that supports 300000 web requests each minute when experiencing peak traffic. The application will use Amazon Route 53 for DNS resolution Amazon CloudFront as the content delivery network(CDN)an Elastic Load Balancer for load balancing.Amazon EC2 Auto Scaling groups to scale the application tier and Amazon Aurora MySQL as the backend database. The backend database load will average 90% reads and 10% writes. The company wants to build a cost- effective solution but reliability is critical.Which set of strategies should the solutions architect use?
A.Build the application in a single AWS Region. Deploy the EC2 application layer to three Availability Zones using an Auto Scaling group with dynamic scaling based on request metrics. Use a Multi-AZ Amazon Aurora MySQL DB cluster with two Aurora Replicas. Each Aurora Replica must have enough capacity to support 50% of the peak read queries. B.Build the application in a single AWS Region. Deploy the EC2 application layer to three Availability Zones using an Auto Scaling group with a minimum desired capacity sufficient to process 450000requests each minute. Use a Multi-AZ Amazon Aurora MySQL DB cluster with two Aurora Replicas. Each Aurora Replica must have enough capacity to support 100% of the peak read queries. C.Build the application in a single AWS Region. Deploy the EC2 application layer to two Availability Zones using an Auto Scaling group with a minimum desired capacity sufficient to process 30.0000 requests each minute use a Multi-AZ正确答案B
Amazon Aurora MySQL DB cluster with one Aurora Replica. The Aurora Replica must have enough capacity to support 50% of the peak read and write queries. D.Build the application in two AWS Regions. Deploy the EC2 application layer to two Availability Zones using an Auto Scaling group with dynamic scaling based on the request metrics in each Region in the second Regiondeploy an Amazon Aurora MySQL cross-Region replicaUse Amazon Route 53 to distribute traffic between Regions and configure failover if a Region becomes unavailable.
