ANS-C01 Network Implementation Practice Question
A company is setting up a new VPC with both IPv4 and IPv6 support. They need to ensure that instances in a private subnet can access the Internet for software updates. Which combination of resources is required?
⚠ Common exam trap
The ANS-C01 exam often tests the misconception that an internet gateway can be used for both IPv4 and IPv6 outbound-only access from private subnets, but in reality, an internet gateway allows bidirectional traffic and requires public IPs, whereas an egress-only internet gateway is specifically designed for outbound-only IPv6 traffic from private subnets.
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 and egress-only internet gateway
For IPv6 traffic, an egress-only internet gateway allows outbound-only internet access from private subnets, while a NAT gateway provides similar functionality for IPv4 traffic. Together, they enable instances in a private subnet to initiate outbound connections to the internet for software updates without allowing inbound connections from the internet.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
VPC endpoint and internet gateway
Why it's wrong here
VPC endpoint is for specific AWS services, not general internet.
- ✓
NAT gateway and egress-only internet gateway
Why this is correct
NAT for IPv4, egress-only for IPv6.
- ✗
NAT instance and internet gateway
Why it's wrong here
NAT instance is not recommended; internet gateway not for private subnets.
- ✗
Internet gateway and NAT gateway
Why it's wrong here
Internet gateway is for public subnets; NAT gateway only for IPv4.
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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.