ANS-C01 Network Implementation Practice Question
Which TWO of the following are valid methods to provide outbound internet access to instances in a private subnet?
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
✓
Deploy a NAT instance in a public subnet and configure routing
The correct answers are C and D. A NAT instance (C) or a NAT gateway (D) deployed in a public subnet with a default route pointing to them from the private subnet provides outbound internet access while keeping instances private. Option A is incorrect because VPC endpoints only provide private access to AWS services, not general internet. Option B is incorrect because an internet gateway is attached to the VPC, not directly to a subnet, and instances in private subnets cannot use it without a NAT device. Option E is incorrect because a VPN connection is for private connectivity to on-premises networks, not internet access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use a VPC endpoint for internet access
Why it's wrong here
VPC endpoints provide private access to AWS services, not general internet.
- ✗
Attach an internet gateway directly to the private subnet
Why it's wrong here
Internet gateway requires instances to have public IPs; private subnets do not have direct internet gateway attachment.
- ✓
Deploy a NAT instance in a public subnet and configure routing
Why this is correct
NAT instance is a legacy but valid method.
- ✓
Deploy a NAT gateway in a public subnet and add a route to it from the private subnet
Why this is correct
NAT gateway allows private instances to access the internet.
- ✗
Use a VPN connection to the internet
Why it's wrong here
VPN connects to on-premises, not the internet.
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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.