ANS-C01 Network Design Practice Question
A company is designing a VPC for a three-tier application. The web tier must be accessible from the internet, the application tier must only be accessible from the web tier, and the database tier must only be accessible from the application tier. Which THREE design elements are required? (Choose THREE.)
⚠ Common exam trap
The ANS-C01 exam often tests the misconception that a NAT gateway is required for private subnets in any multi-tier architecture, but here the private subnets only need internal routing between tiers, not outbound internet access.
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
✓
A public subnet for the web tier with an internet gateway
The web tier requires direct internet accessibility, which is achieved by placing it in a public subnet associated with an internet gateway. The internet gateway provides a target for the subnet's route table to allow inbound traffic from the internet and outbound responses, enabling users to reach the web application.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A public subnet for the web tier with an internet gateway
Why this is correct
Provides internet access to web servers.
- ✓
A private subnet for the database tier with a route to the application subnet
Why this is correct
Isolates database tier.
- ✓
A private subnet for the application tier with a route to the web subnet
Why this is correct
Isolates app tier from internet.
- ✗
A NAT gateway in the public subnet for outbound traffic from private subnets
Why it's wrong here
Not required for the described access pattern.
- ✗
A VPN connection to on-premises
Why it's wrong here
No on-premises mentioned.
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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.