ANS-C01 Network Design Practice Question
A company is designing a VPC for a web application that requires high availability. The application will be deployed across multiple Availability Zones. Which THREE components are essential for a highly available network design? (Choose THREE.)
⚠ Common exam trap
The ANS-C01 exam often tests the misconception that a single VPN connection or VPC peering provides high availability, but in reality, these are single points of failure unless explicitly designed with redundancy (e.g., multiple VPN tunnels or multi-region peering).
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
✓
Subnets in at least two Availability Zones
Deploying subnets in at least two Availability Zones (AZs) ensures that if one AZ fails, the application can continue serving traffic from the other AZ. This is the foundational principle of high availability in AWS, as it provides fault isolation at the data center level. Without multi-AZ subnets, a single AZ failure would cause a complete outage.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Subnets in at least two Availability Zones
Why this is correct
Provides AZ redundancy.
- ✗
A single VPN connection to on-premises
Why it's wrong here
Single point of failure.
- ✓
A NAT gateway in each Availability Zone
Why this is correct
Ensures outbound connectivity during AZ failure.
- ✗
VPC peering with a backup VPC
Why it's wrong here
Not essential for single VPC high availability.
- ✓
An internet gateway attached to the VPC
Why this is correct
Required for public internet access.
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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.