ANS-C01 Network Design Practice Question
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?
⚠ Common exam trap
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.
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.
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
Why it's wrong here
Direct Connect Gateway does not provide NAT functionality.
- ✗
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
Why this is correct
Private NAT Gateway translates VPC IPs to a different range, allowing communication with overlapping on-premises addresses.
- ✗
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.