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 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?
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.
Option A is correct because 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.
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.
✓
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.
Related concept
Read the scenario before looking for a memorised answer.
✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates 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.
Detailed technical explanation
How to think about this question
AWS Transit Gateway supports Network Address Translation (NAT) at the attachment level using Transit Gateway Connect or by integrating with a NAT appliance (e.g., a third-party firewall) to perform IP address translation for overlapping CIDRs. Under the hood, the Transit Gateway uses a routing table that can direct traffic to a NAT function, which rewrites the source or destination IP addresses before forwarding packets to the peered VPC, effectively resolving the conflict without requiring non-overlapping 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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: Use an AWS Transit Gateway with Network Address Translation (NAT) to resolve overlapping CIDRs. — Option A is correct because 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.
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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Question Discussion
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