AWS Certified Solutions Architect Associate SAA-C03 Practice Question
A company's application is deployed across multiple EC2 instances in an Auto Scaling group behind an Application Load Balancer. The company requires minimal downtime, even if an entire Availability Zone becomes unavailable. Which disaster-recovery approach BEST meets this requirement?
Extend the Auto Scaling group to multiple Availability Zones within the same region.
Configure a Pilot Light environment in another region.
Implement a Backup and Restore strategy with daily backups.
Use an Active-Active deployment across two different cloud service providers.
Extending the Auto Scaling group to span two or more Availability Zones within the same AWS Region keeps at least one healthy instance available if a zone fails. The ALB automatically routes traffic only to healthy AZs, and the Auto Scaling group launches replacement instances in the remaining zones, providing seamless failover with no manual intervention.
Backup and Restore and Pilot Light are cross-Region strategies; both need time to restore or scale infrastructure, resulting in higher recovery-time objectives for an AZ-level event.
An Active-Active deployment across two cloud providers can also achieve high availability, but it is significantly more complex and costly than required for protection against a single-AZ outage. AWS's own guidance recommends starting with Multi-AZ high availability before adopting multi-provider or multi-Region Active-Active designs.
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