ANS-C01 Network Implementation Practice Question
A network engineer is designing a VPC with public and private subnets. The private subnets must have outbound internet access but not be directly reachable from the internet. Which AWS service should be used?
⚠ Common exam trap
Many candidates confuse a NAT Gateway with an Internet Gateway, mistakenly thinking an IGW can provide outbound-only access, when in fact an IGW allows bidirectional traffic and would expose private subnets to the internet.
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 is the correct choice because it enables instances in private subnets to initiate outbound internet traffic (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, providing one-way internet access without direct reachability.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
NAT Gateway
Why this is correct
NAT Gateway provides outbound internet without inbound.
- ✗
Elastic IP Address (EIP)
Why it's wrong here
EIP is an IP address, not a service for outbound access.
- ✗
Internet Gateway (IGW)
Why it's wrong here
IGW allows inbound internet traffic.
- ✗
Virtual Private Gateway (VGW)
Why it's wrong here
VGW is for VPN connections.
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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.