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Answer: Distribute the Auto Scaling group across two Availability Zones with three instances in each.
The correct answer is B: Modify the Auto Scaling group to use three instances across each of two Availability Zones. This setup ensures that the application is highly available by distributing instances across multiple Availability Zones, which allows the application to remain operational even if one Availability Zone experiences an outage. The other options do not achieve high availability in the same way. Option A suggests using instances across two Regions, which introduces complexity and latency issues. Option C only provides a template and does not address immediate high availability. Option D does not utilize multiple Availability Zones, which is key for high availability.
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How should a solutions architect modify the existing infrastructure to achieve high availability for a multi-tier application with six front-end web servers in a single Availability Zone, without altering the application itself?
A
Expand the Auto Scaling group to span two Regions with three instances each.
B
Distribute the Auto Scaling group across two Availability Zones with three instances in each.
C
Develop an Auto Scaling template for rapid instance deployment in an additional Region.
D
Implement a round-robin ALB configuration to distribute traffic among the EC2 instances.
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