SAA-C03 Design Resilient Architectures Practice Question
A healthcare company runs a critical patient-records API on Amazon EC2 instances behind an Application Load Balancer in a single AWS Region. The compliance team mandates that the API remain available even if an entire AWS Region becomes unavailable. The company wants a cost-effective solution that avoids running full production capacity in a second Region at all times. Which approach BEST meets these requirements?
⚠ Common exam trap
The trap here is assuming that Multi-AZ deployment provides protection against a complete AWS Region failure, when it only protects against Availability Zone failures within a single Region.
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
✓
Deploy the API in a second Region with a minimal warm standby environment, and use Amazon Route 53 failover routing with health checks to shift traffic when the primary Region fails.
A warm standby in a second Region with Route 53 failover routing provides cross-Region resilience while controlling cost. The standby runs at reduced capacity and can be scaled up during a Regional failure. Health checks trigger automatic DNS failover, so clients reach the surviving Region without manual intervention. This design directly addresses the need to survive a full Region outage without duplicating full production capacity at all times.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Deploy the API in a second Region with a minimal warm standby environment, and use Amazon Route 53 failover routing with health checks to shift traffic when the primary Region fails.
Why this is correct
A warm standby keeps a scaled-down but functional stack in the secondary Region, which can be scaled up during a failover. Route 53 failover routing with health checks automatically redirects traffic when the primary endpoint becomes unhealthy. This balances cost and recovery time, meeting the cross-Region availability requirement without paying for full duplicate capacity.
- ✗
Create an Amazon CloudFront distribution with the existing ALB as the origin, and enable origin failover to a second ALB in another Region.
Why it's wrong here
CloudFront origin failover can switch to a secondary origin when the primary origin returns certain errors, but the secondary ALB still needs a running backend in another Region. Without a deployed standby environment, failover has nothing to serve. CloudFront alone does not provide compute capacity in a second Region, so the API would still be unavailable.
- ✗
Take regular Amazon EBS snapshots of the EC2 instances and copy them to a second Region, then restore the instances manually if the primary Region fails.
Why it's wrong here
Copying EBS snapshots provides data durability across Regions but does not maintain a running environment. Restoring instances manually introduces significant recovery time and requires rebuilding load balancers, security groups, and other dependencies. This approach does not meet the requirement for continued availability and is not a resilient architecture.
- ✗
Enable Multi-AZ deployment for the EC2 instances and the Application Load Balancer, and rely on the existing single-Region architecture to survive a Regional failure.
Why it's wrong here
Multi-AZ distributes resources across Availability Zones within one Region, protecting against AZ-level failures but not against the loss of an entire Region. If the Region itself becomes unavailable, all AZs in that Region are affected. This approach cannot satisfy the stated requirement of surviving a Regional outage.
Go deeper
Related to this question
About these practice questions
Courseiva writes every SAA-C03 question from scratch — 935 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
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
This SAA-C03 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SAA-C03 exam.