The answer is Transit Gateway inter-Region peering. This is the correct choice because it enables VPCs in different AWS Regions to communicate using private IP addresses through a central Transit Gateway, eliminating the need for individual VPC peering connections. The feature leverages the AWS global network to route traffic between peered Transit Gateways, creating a hub-and-spoke architecture that scales across regions without the complexity of managing multiple point-to-point peering links. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this question tests your understanding of cross-region connectivity options and the distinction between Transit Gateway peering and VPC peering—a common trap is confusing inter-Region VPC peering (which requires explicit route table entries per VPC) with Transit Gateway inter-Region peering (which centralizes routing). A helpful memory tip: think of Transit Gateway inter-Region peering as a “global hub” that lets you connect regions without the “spoke-to-spoke” headache of individual peering.
ANS-C01 Network Design Practice Question
This ANS-C01 practice question tests your understanding of network design. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 wants to connect multiple VPCs across different AWS Regions using AWS Transit Gateway. Which feature allows the VPCs to communicate with each other using private IP addresses without creating peering connections?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Transit Gateway inter-Region peering
Transit Gateway inter-Region peering allows VPCs in different AWS Regions to communicate using private IP addresses through a central Transit Gateway, without requiring individual VPC peering connections. This feature uses the AWS global network to route traffic between peered Transit Gateways, enabling cross-region connectivity with a hub-and-spoke architecture.
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.
✗
AWS Direct Connect gateway
Why it's wrong here
Direct Connect gateway connects on-premises to VPCs, not VPC-to-VPC across Regions.
✗
AWS PrivateLink
Why it's wrong here
PrivateLink is used to access services privately, not for VPC-to-VPC routing.
✓
Transit Gateway inter-Region peering
Why this is correct
Transit Gateway supports inter-Region peering for transitive routing between VPCs across Regions.
Related concept
Read the scenario before looking for a memorised answer.
✗
VPC Peering
Why it's wrong here
VPC Peering requires individual peering connections between each VPC pair.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse Transit Gateway inter-Region peering with VPC Peering, assuming VPC Peering is the only way to connect VPCs across regions, but Transit Gateway provides a scalable, centralized alternative without the need for full-mesh peering.
Detailed technical explanation
How to think about this question
Transit Gateway inter-Region peering leverages the AWS global infrastructure to route traffic between Transit Gateways in different regions, using the same attachment-based model as intra-region Transit Gateways. Each peering attachment is established between two Transit Gateways, and route tables must be configured to propagate and associate routes for cross-region traffic. This design supports transitive routing across multiple VPCs and regions, but note that inter-region peering does not support multicast or equal-cost multi-path (ECMP) routing.
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: Transit Gateway inter-Region peering — Transit Gateway inter-Region peering allows VPCs in different AWS Regions to communicate using private IP addresses through a central Transit Gateway, without requiring individual VPC peering connections. This feature uses the AWS global network to route traffic between peered Transit Gateways, enabling cross-region connectivity with a hub-and-spoke architecture.
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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