ANS-C01 Network Implementation Practice Question
A company is designing a VPC with public and private subnets. They want EC2 instances in private subnets to be able to access the internet for software updates. Which AWS service should they use?
⚠ Common exam trap
The ANS-C01 exam often tests the misconception that an Internet Gateway (IGW) can be used for private subnet outbound access, but the trap is that IGWs only work with public subnets that have a route to the IGW and instances with public IPs; private subnets require a NAT device for outbound-only 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
✓
NAT Gateway
A NAT Gateway enables EC2 instances in private subnets to initiate outbound traffic to the internet (e.g., for software updates) while preventing the internet from initiating inbound connections to those instances. It translates the private IP addresses of the instances to the NAT Gateway's Elastic IP address using source network address translation (SNAT), allowing them to reach public endpoints.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
AWS Direct Connect
Why it's wrong here
Direct Connect is a private connection to on-premises, not to the internet.
- ✗
Internet Gateway (IGW)
Why it's wrong here
An IGW is used for public subnets; attaching it to a private subnet would make it public.
- ✗
VPC Peering connection
Why it's wrong here
VPC Peering connects VPCs, not to the internet.
- ✓
NAT Gateway
Why this is correct
A NAT Gateway enables outbound internet access for instances in private subnets.
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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.