- A
Use a VPC endpoint for internet access
Why wrong: VPC endpoints provide private access to AWS services, not general internet.
- B
Attach an internet gateway directly to the private subnet
Why wrong: Internet gateway requires instances to have public IPs; private subnets do not have direct internet gateway attachment.
- C
Deploy a NAT instance in a public subnet and configure routing
NAT instance is a legacy but valid method.
- D
Deploy a NAT gateway in a public subnet and add a route to it from the private subnet
NAT gateway allows private instances to access the internet.
- E
Use a VPN connection to the internet
Why wrong: VPN connects to on-premises, not the internet.
Question 1,065 of 1,705
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
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.
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.
- ✗
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
- ✓
Deploy a NAT instance in a public subnet and configure routing
- ✓
Deploy a NAT gateway in a public subnet and add a route to it from the private subnet
- ✗
Use a VPN connection to the internet
Why it's wrong here
VPN connects to on-premises, not the internet.
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.
Visual reference
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: 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.
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
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