Home / Amazon / SAA-C01 / Question 324

A Solutions Architect needs to convert potential single points of failure to a highly-available configuration. The current architecture contains Amazon EC2 instances with databases running in one Availability Zone. Web-tier resources have not been given public addresses, but still require Internet access.Which solution should the Architect use to maintain high availability?

• A. Use ELB Classic Load Balancer with the web tier. Deploy EC2 instances in two Availability Zones and enable Multi-AZ RDS. Deploy a NAT gateway in one Availability Zone.

• B. Use ELB Classic Load Balancer with the web tier. Deploy EC2 instances in two Availability Zones and enable Multi-AZ RDS. Deploy NAT gateways in both Availability Zones.

• C. Use ELB Classic Load Balancer with the database tier. Deploy Amazon EC2 instances in two Availability Zones and enable Multi-AZ RDS. Deploy NAT gateways in both Availability Zones.

• D. Use ELB Classic Load Balancer with the database tier. Deploy Amazon EC2 instances in two Availability Zones and enable Multi-AZ RDS. Deploy a NAT gateway in one Availability Zone.