ANS-C01 Network Design Practice Question
A company is designing a VPC with both IPv4 and IPv6 CIDR blocks. The VPC must support internet-facing applications accessible via IPv6. Which resource must be configured as IPv6-enabled to allow internet traffic?
⚠ Common exam trap
AWS often tests the misconception that a NAT Gateway can handle IPv6 traffic, but NAT is not used for IPv6 due to the abundance of globally unique addresses; the correct resource for IPv6 internet access is always the Internet Gateway.
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
✓
Internet Gateway
An Internet Gateway (IGW) is the only resource that supports both IPv4 and IPv6 traffic and provides a target in the VPC route table for IPv6 default routes (::/0) to enable direct internet access for IPv6-enabled resources. Unlike IPv4, which often requires NAT for private addressing, IPv6 globally unique addresses allow direct communication through the IGW without translation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Internet Gateway
Why this is correct
Internet Gateway supports both IPv4 and IPv6 traffic.
- ✗
VPC Peering connection
Why it's wrong here
VPC Peering is for private connectivity, not internet access.
- ✗
NAT Gateway
Why it's wrong here
NAT Gateway only supports IPv4 outbound traffic.
- ✗
Transit Gateway
Why it's wrong here
Transit Gateway is for internal routing, not internet access.
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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.