- A
Configure Direct Connect Gateway with network address translation
Why wrong: Direct Connect Gateway does not provide NAT functionality.
- B
Use AWS Transit Gateway with route table separation
Why wrong: Transit Gateway does not resolve IP overlap; separate route tables do not prevent conflicts.
- C
Deploy a Private NAT Gateway in the VPC and configure routes to send on-premises traffic through it
Private NAT Gateway translates VPC IPs to a different range, allowing communication with overlapping on-premises addresses.
- D
Set up VPC Peering between the VPC and on-premises network over Direct Connect
Why wrong: VPC Peering requires non-overlapping CIDRs and cannot be used with on-premises networks.
Question 1,189 of 1,705
ANS-C01 Network Design Practice Question
This ANS-C01 practice question tests your understanding of network design. 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.
A company has a VPC with an IPv4 CIDR of 10.0.0.0/16. They need to connect their on-premises data center to AWS using AWS Direct Connect. The data center uses RFC 1918 addresses from the 10.0.0.0/8 range, overlapping with the VPC CIDR. The company cannot change the on-premises IP addresses. Which design allows connectivity without IP conflicts?
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 Private NAT Gateway in the VPC and configure routes to send on-premises traffic through it
A Private NAT Gateway in the VPC allows the on-premises network to reach the VPC by translating overlapping IP addresses. Since the on-premises network uses the same 10.0.0.0/8 range as the VPC's 10.0.0.0/16 CIDR, traffic from the data center to the VPC must be source NATed to a non-overlapping IP range. The Private NAT Gateway performs this translation, enabling bidirectional communication without IP conflicts.
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.
- ✗
Configure Direct Connect Gateway with network address translation
- ✗
Use AWS Transit Gateway with route table separation
Why it's wrong here
Transit Gateway does not resolve IP overlap; separate route tables do not prevent conflicts.
- ✓
Deploy a Private NAT Gateway in the VPC and configure routes to send on-premises traffic through it
- ✗
Set up VPC Peering between the VPC and on-premises network over Direct Connect
Why it's wrong here
VPC Peering requires non-overlapping CIDRs and cannot be used with on-premises networks.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The ANS-C01 exam often tests the misconception that a Direct Connect Gateway or Transit Gateway can resolve IP overlaps, but these services only route traffic and do not perform NAT, making a Private NAT Gateway the only correct solution for overlapping CIDRs.
Detailed technical explanation
How to think about this question
A Private NAT Gateway is deployed in a VPC with an Elastic IP (for internet NAT) or without (for private NAT), and it translates source IPs from overlapping ranges to a different CIDR block (e.g., 100.64.0.0/10) using 1:1 NAT. This allows on-premises traffic to reach VPC resources without IP conflicts, but requires careful route table configuration to direct traffic through the NAT Gateway. In real-world scenarios, this is common when merging companies with overlapping RFC 1918 address spaces.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deploy a Private NAT Gateway in the VPC and configure routes to send on-premises traffic through it — A Private NAT Gateway in the VPC allows the on-premises network to reach the VPC by translating overlapping IP addresses. Since the on-premises network uses the same 10.0.0.0/8 range as the VPC's 10.0.0.0/16 CIDR, traffic from the data center to the VPC must be source NATed to a non-overlapping IP range. The Private NAT Gateway performs this translation, enabling bidirectional communication without IP conflicts.
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
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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