- A
Attach an internet gateway to the private subnets and configure route tables.
Why wrong: Attaching an internet gateway to private subnets would allow inbound traffic, violating the unreachability requirement.
- B
Deploy a NAT Gateway in a public subnet and add a route to the NAT Gateway in the private subnet route tables.
NAT Gateway enables outbound internet connectivity while preventing inbound traffic from the internet.
- C
Use a transit gateway to connect the VPC to the internet.
Why wrong: A transit gateway does not provide internet access; it connects VPCs and on-premises networks.
- D
Establish a VPN connection to an on-premises network and route traffic through it.
Why wrong: A VPN connection provides access to on-premises networks, not necessarily the internet.
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company is deploying a VPC with public and private subnets in two Availability Zones. They need to ensure that instances in private subnets can access the internet for software updates while remaining unreachable from the internet. Which solution meets these requirements?
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 Gateway in a public subnet and add a route to the NAT Gateway in the private subnet route tables.
Option B is correct because a NAT Gateway deployed in a public subnet provides outbound-only internet access for instances in private subnets. The private subnet route table directs 0.0.0.0/0 traffic to the NAT Gateway, which translates the private IPs to the NAT Gateway's Elastic IP, allowing internet access while preventing any unsolicited inbound connections from the internet.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Attach an internet gateway to the private subnets and configure route tables.
Why it's wrong here
Attaching an internet gateway to private subnets would allow inbound traffic, violating the unreachability requirement.
- ✓
Deploy a NAT Gateway in a public subnet and add a route to the NAT Gateway in the private subnet route tables.
- ✗
Use a transit gateway to connect the VPC to the internet.
Why it's wrong here
A transit gateway does not provide internet access; it connects VPCs and on-premises networks.
- ✗
Establish a VPN connection to an on-premises network and route traffic through it.
Why it's wrong here
A VPN connection provides access to on-premises networks, not necessarily the internet.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the misconception that an internet gateway can be directly associated with private subnets, but the trap here is that an internet gateway enables bidirectional traffic, so attaching it to private subnets would expose instances to inbound internet connections, violating the requirement for unreachability from the internet.
Detailed technical explanation
How to think about this question
A NAT Gateway operates at the network layer, performing source network address translation (SNAT) by replacing the private source IP with its own Elastic IP address for outbound traffic, and it maintains stateful connections so that return traffic is correctly forwarded back to the private instance. Unlike a NAT instance, a NAT Gateway is managed by AWS, scales automatically up to 45 Gbps, and does not require patching or failover handling. In a multi-AZ deployment, a NAT Gateway should be placed in each AZ with a public subnet to ensure high availability, as a single NAT Gateway in one AZ becomes a single point of failure if that AZ goes down.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deploy a NAT Gateway in a public subnet and add a route to the NAT Gateway in the private subnet route tables. — Option B is correct because a NAT Gateway deployed in a public subnet provides outbound-only internet access for instances in private subnets. The private subnet route table directs 0.0.0.0/0 traffic to the NAT Gateway, which translates the private IPs to the NAT Gateway's Elastic IP, allowing internet access while preventing any unsolicited inbound connections from the internet.
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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.
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