An application is running on Amazon EC2 instances behind an Application Load Balancer. The instances run in an Auto Scaling group across multiple Availability Zones. Four instances are required to handle a predictable traffic load. The Solutions Architect wants to ensure that the operation is fault-tolerant up to the loss of one Availability Zone.
Which is the MOST cost-efficient way to meet these requirements?
A. Deploy two instances in each of three Availability Zones.
B. Deploy two instances in each of two Availability Zones.
C. Deploy four instances in each of two Availability Zones.
D. Deploy one instance in each of three Availability Zones.
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A. 2 inst in each of 3AZ => Total of 6 inst
if 1AZ fails then 2 inst in each of 2AZ => 4 inst ====== Correct
B. 2 inst in each of 2AZ => Total of 4 inst
if 1AZ fails then 2 inst in each of 1AZ => 2 inst ======Incorrect
C. 4 inst in each of 2AZ => Total of 8 inst
if 1AZ fails then 4 inst in each of 1AZ => 4 inst ====== Incorrect since the ASG works in Multi-AZ
D. 1 inst in each of 3AZ => Total of 3inst <4 ====Incorrect
Shumet, how did you exam go… were these questions helpful.