SOA-C02 Deployment, Provisioning, and Automation Practice Question
A company runs a critical production workload on a fleet of EC2 instances managed by an Auto Scaling group. The instances are behind an Application Load Balancer (ALB). Recently, the company experienced a regional outage that caused all instances to become unhealthy. The SysOps administrator must design a solution to automatically recover from such an outage with minimal downtime. The solution must be cost-effective and not require manual intervention. The administrator considers four options. Which option meets the requirements?
⚠ Common exam trap
SOA-C02 often tests the misconception that multi-AZ equals multi-Region — candidates must recognize that only cross-Region designs survive a full regional outage.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a warm standby environment in another AWS Region with a smaller Auto Scaling group. Use Route53 failover routing to switch traffic.
A regional outage takes down all Availability Zones in a Region, so only a cross-Region strategy can recover. A warm standby environment in another Region with a smaller Auto Scaling group, combined with Route 53 failover routing, provides automatic, low-downtime recovery without manual intervention. This is the AWS-recommended pattern for regional resilience and is more cost-effective than a fully active-active multi-Region deployment.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure the Auto Scaling group to launch instances across multiple Availability Zones and configure the ALB to route traffic to healthy targets.
Why it's wrong here
Spreading instances across Availability Zones within one Region does not survive a regional outage; all zones fail together. It is tempting because multi-AZ Auto Scaling is the standard resilience pattern, and it would be correct for an Availability Zone failure rather than the regional failure described.
- ✗
Increase the desired capacity of the Auto Scaling group and use larger instance types to absorb the load during failover.
Why it's wrong here
Larger instances and higher desired capacity remain in the affected Region, so a regional outage still takes them offline; capacity does not address regional failure. It is tempting because scaling absorbs load spikes, and it would be correct for demand surges rather than infrastructure loss.
- ✓
Create a warm standby environment in another AWS Region with a smaller Auto Scaling group. Use Route53 failover routing to switch traffic.
Why this is correct
A warm standby in a second Region with a smaller Auto Scaling group keeps capacity running at reduced cost, and Route 53 failover routing redirects traffic automatically when health checks fail. This satisfies the regional-outage, minimal-downtime and no-manual-intervention requirements.
- ✗
Use AWS Lambda to periodically check the health of instances and automatically relaunch failed instances in another region.
Why it's wrong here
Lambda health checks and relaunching instances in another Region require the workload, AMI, and networking to already exist there, and polling adds detection delay; it is not automatic recovery. It is tempting because cross-Region failover is a genuine DR pattern, but it needs pre-provisioned infrastructure.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Amazon Web Services exam blueprint
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