ANS-C01 Network Design Practice Question
A company wants to improve the performance and availability of its application that is deployed on EC2 instances in a single Availability Zone. Which architecture should the company implement?
⚠ Common exam trap
The ANS-C01 exam often tests the misconception that adding more subnets or using Auto Scaling within a single AZ improves availability, when in reality only distributing resources across multiple AZs provides true fault tolerance.
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 EC2 instances in multiple Availability Zones
Deploying EC2 instances across multiple Availability Zones (AZs) improves both performance and availability by eliminating a single point of failure. If one AZ experiences an outage, traffic can be routed to healthy instances in another AZ using an Elastic Load Balancer or Route 53 DNS failover. This architecture also distributes the load, reducing latency for users in different geographic regions.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Add more subnets in the same Availability Zone
Why it's wrong here
More subnets in one AZ do not improve availability.
- ✓
Deploy EC2 instances in multiple Availability Zones
Why this is correct
Multi-AZ deployment provides high availability.
- ✗
Use larger EC2 instances
Why it's wrong here
Larger instances do not provide fault tolerance.
- ✗
Use Auto Scaling in the same Availability Zone
Why it's wrong here
Auto Scaling in one AZ does not protect against AZ failure.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This ANS-C01 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 ANS-C01 exam.