AWS Certified Solutions Architect Professional Exam Question NO : 6

Your company runs a customer facing event registration site. This site is built with a 3-tier

architecture with web and application tier servers and a MySQL database. The application

requires 6 web tier servers and 6 application tier servers for normal operation, but can run

on a minimum of 65% server capacity and a single MySQL database. When deploying this

application in a region with three availability zones (AZs), which architecture provides high

availability?

A.  A web tier deployed across 3 AZs with 2 EC2 (Elastic Compute Cloud) instances in each

AZ inside an Auto Scaling Group behind an ELB (elastic load balancer), and an application

tier deployed across 3 AZs with 2 EC2 instances In each AZ inside an Auto Scaling Group

behind an ELB, and a Multi-AZ RDS (Relational Database Service) deployment.

C. d. A web tier deployed across 2 AZs with 3 EC2 (Elastic Compute Cloud) instances in

each AZ inside an Auto Scaling Group behind an ELB (elastic load balancer), and an

application tier deployed across 2 AZs with 3 EC2 instances in each AZ inside an Auto

Scaling Group behind an ELB, and a Multi-AZ RDS (Relational Database Service)

Deployment.

B. A web tier deployed across 2 AZs with 3 EC2 (Elastic Compute Cloud) instances in each

A2 inside an Auto Scaling Group behind an ELB (elastic load balancer), and an application

tier deployed across 2 AZs with 3 EC2 instances In each AZ inside an Auto Scaling Group

behind an ELB, and one RDS (Relational Database Service) instance deployed with read

replicas in the other AZ.

C. A web tier deployed across 3 AZs with 2 EC2 (Elastic Compute Cloud) instances in each

AZ inside an Auto Scaling Group behind an ELB (elastic load balancer), and an application

tier deployed across 3 AZs with 2 EC2 instances in each AZ inside an Auto Scaling Group

behind an ELB, and one RDS (Relational Database Service) instance deployed with read

replicas in the two other AZs.