CV0-004 Cloud Architecture and Design Practice Question
A company is designing a VPC in AWS. They need to host a web application with a public-facing load balancer, web servers in private subnets, and a database in a separate private subnet. Which network architecture is most secure and aligns with best practices?
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
✓
Public subnet for load balancer, private subnet for web servers, separate private subnet for database
A three-tier architecture with a public subnet for the load balancer, private subnets for web servers, and a separate private subnet for the database provides security and isolation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Public subnet for load balancer, private subnet for web servers and database together
Why it's wrong here
Mixing web servers and database in the same subnet reduces security isolation.
- ✓
Public subnet for load balancer, private subnet for web servers, separate private subnet for database
Why this is correct
This three-tier architecture follows best practices for security and isolation.
- ✗
All resources in public subnets with security groups restricting access
Why it's wrong here
Placing all resources in public subnets exposes them unnecessarily.
- ✗
All resources in private subnets with a VPN connection
Why it's wrong here
A public load balancer cannot be in a private subnet if it needs to be internet-facing.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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