- 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.
Quick Answer
The correct choice is to create a NAT gateway in a public subnet and add a route to it from the private subnets' route tables. This works because the NAT gateway, residing in a public subnet with an attached internet gateway, translates private IP addresses to its own public IP for outbound traffic, while its stateful firewall automatically blocks any unsolicited inbound connections. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of how to enable outbound internet access from a private subnet without exposing resources to inbound traffic—a common trap is confusing a NAT gateway with an internet gateway, which would allow bidirectional traffic and violate the requirement. Remember the key distinction: a NAT gateway is for outbound-only internet access from private subnets, whereas an internet gateway is for direct public access. A useful memory tip is “NAT = No Access To” inbound traffic, keeping your private subnet secure while reaching the internet for patches.
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.
Option B is correct because a NAT gateway in a public subnet provides outbound internet access for instances in private subnets while blocking unsolicited inbound connections. Option A is wrong because an internet gateway attached to the private subnet would allow inbound traffic. Option C is wrong because a VPC endpoint is for private connectivity to AWS services, not general internet. Option D is wrong because a VPN connection is for private connectivity to a remote network, not internet access.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — CIDR notation defines the prefix length..
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. — Option B is correct because a NAT gateway in a public subnet provides outbound internet access for instances in private subnets while blocking unsolicited inbound connections. Option A is wrong because an internet gateway attached to the private subnet would allow inbound traffic. Option C is wrong because a VPC endpoint is for private connectivity to AWS services, not general internet. Option D is wrong because a VPN connection is for private connectivity to a remote network, not internet access.
What should I do if I get this ANS-C01 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 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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