- A
Launch a NAT instance in the private subnet and configure source/destination check.
Why wrong: NAT instance should be in a public subnet to access the internet.
- B
Create a VPC endpoint for the patch service.
Why wrong: VPC endpoints are for private access to specific AWS services, not general internet downloads.
- C
Create a NAT gateway in the public subnet and add a default route to the NAT gateway in the private subnet's route table.
NAT gateway enables outbound internet access for private instances while preventing inbound traffic.
- D
Attach an internet gateway to the VPC and add a default route to it in the private subnet's route table.
Why wrong: Private instances need a NAT device to translate their private IPs; an internet gateway alone does not provide outbound connectivity.
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 has a VPC with a public subnet and a private subnet. They launch an EC2 instance in the private subnet with a private IP only. The instance needs to download patches from the internet. Which configuration is required?
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 the public subnet and add a default route to the NAT gateway in the private subnet's route table.
Option B is correct because a NAT gateway in the public subnet allows instances in private subnets to initiate outbound traffic to the internet. Option A is incorrect because an internet gateway alone does not allow private instances to access the internet. Option C is incorrect because a NAT instance requires manual configuration. Option D is incorrect because a VPC endpoint is for specific AWS services, not general 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.
- ✗
Launch a NAT instance in the private subnet and configure source/destination check.
Why it's wrong here
NAT instance should be in a public subnet to access the internet.
- ✗
Create a VPC endpoint for the patch service.
Why it's wrong here
VPC endpoints are for private access to specific AWS services, not general internet downloads.
- ✓
Create a NAT gateway in the public subnet and add a default route to the NAT gateway in the private subnet's route table.
- ✗
Attach an internet gateway to the VPC and add a default route to it in the private subnet's route table.
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 the public subnet and add a default route to the NAT gateway in the private subnet's route table. — Option B is correct because a NAT gateway in the public subnet allows instances in private subnets to initiate outbound traffic to the internet. Option A is incorrect because an internet gateway alone does not allow private instances to access the internet. Option C is incorrect because a NAT instance requires manual configuration. Option D is incorrect because a VPC endpoint is for specific AWS services, not general 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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