SAP-C02 Design for New Solutions Practice Question
A company is designing a new web application that will be deployed on Amazon EC2 instances behind an Application Load Balancer (ALB). The application must be highly available and fault-tolerant across multiple Availability Zones. Which THREE actions should the company take to meet these requirements? (Choose three.)
⚠ Common exam trap
Many exam-takers confuse vertical scaling (larger instances) with horizontal scaling and fault tolerance, or mistakenly think that using a single Availability Zone can be compensated by other means, ignoring the fundamental requirement for multi-AZ deployment.
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
✓
Launch EC2 instances in an Auto Scaling group across multiple Availability Zones.
Launching EC2 instances in an Auto Scaling group across multiple Availability Zones ensures that the application can withstand the failure of an entire Availability Zone. The Auto Scaling group automatically maintains the desired instance count across the specified zones, providing fault tolerance and high availability.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Launch EC2 instances in an Auto Scaling group across multiple Availability Zones.
Why this is correct
Provides fault tolerance across AZs.
- ✗
Use a larger EC2 instance type to handle failures.
Why it's wrong here
Instance size does not provide fault tolerance.
- ✓
Configure health checks on the ALB target group to automatically replace unhealthy instances.
Why this is correct
Automatically recovers from failures.
- ✓
Configure the ALB to route traffic to instances in multiple Availability Zones.
Why this is correct
Distributes traffic across AZs.
- ✗
Use a single Availability Zone to reduce latency.
Why it's wrong here
Single AZ is not fault-tolerant.
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