- A
Attach an internet gateway to the private subnets and configure route tables accordingly.
Why wrong: An internet gateway in a private subnet would expose instances to inbound internet traffic, violating the requirement to block inbound traffic.
- B
Create a NAT gateway in a public subnet and add a route to the NAT gateway from the private subnets' route tables.
A NAT gateway allows outbound internet traffic from private subnets while preventing unsolicited inbound connections.
- C
Establish a site-to-site VPN connection to an on-premises internet gateway.
Why wrong: A VPN connection provides private connectivity to a remote network, not direct internet access.
- D
Configure a VPC endpoint for the internet in the private subnets.
Why wrong: VPC endpoints provide private connectivity to AWS services, not general internet access.
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 new application in a VPC with public and private subnets. The application servers in the private subnets need to access the internet to download patches. Which configuration meets this requirement without allowing inbound internet traffic?
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
Create a NAT gateway in a public subnet and add a route to the NAT gateway from the private subnets' route tables.
A NAT gateway in a public subnet allows instances in private subnets to initiate outbound connections to the internet (e.g., for patch downloads) while preventing unsolicited inbound traffic from the internet. The private subnet's route table must have a default route (0.0.0.0/0) pointing to the NAT gateway's elastic network interface. This is the standard AWS pattern for outbound-only internet access from private subnets.
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 accordingly.
Why it's wrong here
An internet gateway in a private subnet would expose instances to inbound internet traffic, violating the requirement to block inbound traffic.
- ✓
Create a NAT gateway in a public subnet and add a route to the NAT gateway from the private subnets' route tables.
- ✗
Establish a site-to-site VPN connection to an on-premises internet gateway.
Why it's wrong here
A VPN connection provides private connectivity to a remote network, not direct internet access.
- ✗
Configure a VPC endpoint for the internet in the private subnets.
Why it's wrong here
VPC endpoints provide private connectivity to AWS services, not general internet access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse a NAT gateway with an internet gateway, assuming both provide internet access, but an internet gateway enables bidirectional traffic (including inbound), while a NAT gateway strictly enforces outbound-only access from private subnets.
Detailed technical explanation
How to think about this question
A NAT gateway operates at Layer 4 (TCP/UDP) and performs source network address translation (SNAT), replacing the private source IP with the NAT gateway's public IP. It maintains connection state in a connection tracking table, allowing return traffic for outbound flows only. For high availability, deploy one NAT gateway per Availability Zone, as each is confined to a single AZ and does not fail over across zones.
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.
Visual reference
What to study next
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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: Create a NAT gateway in a public subnet and add a route to the NAT gateway from the private subnets' route tables. — A NAT gateway in a public subnet allows instances in private subnets to initiate outbound connections to the internet (e.g., for patch downloads) while preventing unsolicited inbound traffic from the internet. The private subnet's route table must have a default route (0.0.0.0/0) pointing to the NAT gateway's elastic network interface. This is the standard AWS pattern for outbound-only internet access from private subnets.
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: Jul 4, 2026
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