ANS-C01 Network Design Practice Question
A company has a VPC with a CIDR block of 10.0.0.0/16. The company needs to peer with another VPC that has a CIDR block of 10.0.0.0/16. What should the network engineer do to enable connectivity between the two VPCs?
⚠ Common exam trap
Many exam-takers assume VPC peering can always be established and then fixed with NAT, but AWS VPC peering explicitly requires non-overlapping CIDR blocks at the time of creation, making peering impossible regardless of later NAT configuration.
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
✓
Use an AWS Transit Gateway with Network Address Translation (NAT) to resolve overlapping CIDRs.
When two VPCs have overlapping CIDR blocks (both 10.0.0.0/16), a standard VPC peering connection cannot be established due to route table conflicts. An AWS Transit Gateway can be used with Network Address Translation (NAT) to translate the overlapping IP addresses, enabling connectivity between the VPCs by allowing traffic to be routed through the Transit Gateway with NAT applied to resolve the address conflict.
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 an AWS Transit Gateway with Network Address Translation (NAT) to resolve overlapping CIDRs.
Why this is correct
Transit Gateway can support overlapping CIDRs with NAT.
- ✗
Use an internet gateway to route traffic between the VPCs.
Why it's wrong here
Internet gateways are for internet access, not VPC-to-VPC.
- ✗
Create a VPC peering connection and add routes in both route tables.
Why it's wrong here
Overlapping CIDRs cannot be peered.
- ✗
Create a VPC peering connection and use a network address translation (NAT) device.
Why it's wrong here
VPC peering does not support translating addresses.
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JA
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.