ANS-C01 Network Design Practice Question
A company has a VPC with public and private subnets. The private subnets need outbound internet access for software updates. The company wants to ensure that traffic from private subnets uses a single, highly available IP address for outbound traffic. Which solution meets these requirements?
⚠ Common exam trap
The ANS-C01 exam often tests the misconception that a single NAT instance or a proxy fleet with an NLB can provide both high availability and a single outbound IP, but the trap here is that a NAT gateway is the only managed service that inherently combines high availability with a single elastic IP for outbound traffic without additional configuration.
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
✓
Create a NAT gateway in a public subnet and route traffic from private subnets to it.
A NAT gateway provides managed, highly available outbound internet access for private subnets using a single elastic IP address. It is deployed in a public subnet and automatically handles failover within an Availability Zone, meeting the requirement for a single, highly available IP for outbound traffic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Deploy a single EC2 instance configured as a NAT instance in a public subnet.
Why it's wrong here
A single NAT instance is not highly available.
- ✗
Configure a fleet of proxy servers in an Auto Scaling group with a Network Load Balancer.
Why it's wrong here
Proxy fleet adds complexity and does not guarantee a single IP.
- ✓
Create a NAT gateway in a public subnet and route traffic from private subnets to it.
Why this is correct
NAT gateway is managed, highly available, and provides a single Elastic IP.
- ✗
Use a VPC endpoint for Amazon S3 to access software updates.
Why it's wrong here
VPC endpoints do not provide general internet access.
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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.