ANS-C01 Network Implementation Practice Question
A company is deploying a multi-tier web application across three Availability Zones in a VPC. The web tier must be highly available and scale based on CPU utilization. The database tier uses an Amazon RDS Multi-AZ DB instance. The web tier must have the lowest possible latency to the internet. Which configuration should be used for the web tier subnets?
⚠ Common exam trap
The ANS-C01 exam often tests the misconception that private subnets with a NAT gateway provide lower latency than public subnets with an internet gateway, but the trap here is that NAT gateways introduce additional network hops and are unsuitable for inbound web traffic, making public subnets the correct choice for lowest latency internet-facing web tiers.
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
✓
Place the web tier in public subnets with auto-assign public IP addresses enabled.
Placing the web tier in public subnets with auto-assign public IP addresses enabled ensures that each EC2 instance receives a public IPv4 address automatically, allowing direct internet access for low-latency communication. Public subnets have a route to an internet gateway, which provides the shortest path to the internet without additional hops. This configuration supports high availability across three Availability Zones and integrates with an Auto Scaling group based on CPU utilization.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Place the web tier in public subnets with auto-assign public IP addresses disabled.
Why it's wrong here
Instances need public IPs for direct internet access.
- ✓
Place the web tier in public subnets with auto-assign public IP addresses enabled.
Why this is correct
Public subnets provide direct internet access with lowest latency.
- ✗
Place the web tier in private subnets and use a VPC endpoint for internet access.
Why it's wrong here
VPC endpoints do not provide internet access.
- ✗
Place the web tier in private subnets and use a NAT gateway for internet access.
Why it's wrong here
NAT gateway adds latency.
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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.