The answer is to use Transit Gateway peering attachments between Transit Gateways in different regions, because this enables transitive routing across regions over the AWS global backbone with minimal latency and operational overhead. AWS manages the peering connection and automatically propagates routes, so VPCs attached to different Transit Gateways can communicate without needing VPNs or Direct Connect. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this question tests your understanding of cross-region transitive routing as a native, managed alternative to more complex hub-and-spoke VPN topologies. A common trap is assuming you must use VPC peering or a VPN between regions, but Transit Gateway peering is the simpler, lower-latency solution. Memory tip: think of Transit Gateway peering as a “region-to-region bridge” that keeps routing transitive and management hands-off.
SAP-C02 Practice Question: Design Solutions for Organizational Complexity
This SAP-C02 practice question tests your understanding of design solutions for organizational complexity. 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 has a global AWS environment with multiple VPCs in different regions. The company uses AWS Transit Gateway to connect VPCs in the same region, but they need to interconnect VPCs across regions. The network team wants a solution that provides transitive routing across regions with minimal latency and operational overhead. Which solution should be implemented?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Transit Gateway peering attachments between Transit Gateways in different regions.
Transit Gateway peering attachments enable transitive routing between Transit Gateways in different AWS regions, providing low-latency connectivity over the AWS global network without requiring VPN or Direct Connect. This solution minimizes operational overhead because AWS manages the peering connection and route propagation automatically, allowing VPCs attached to different Transit Gateways to communicate across regions.
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.
✗
Set up a VPN connection between Transit Gateways in different regions.
Why it's wrong here
VPN adds encryption overhead and may increase latency.
✗
Use AWS Direct Connect to connect the Transit Gateways in different regions.
Why it's wrong here
Direct Connect is for on-premises to AWS, not inter-region.
✗
Create VPC peering connections between all VPCs in different regions.
Why it's wrong here
VPC peering is not transitive and requires many connections.
✓
Use Transit Gateway peering attachments between Transit Gateways in different regions.
Why this is correct
Transit Gateway peering provides transitive routing across regions with low latency.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse Transit Gateway peering with VPN or Direct Connect, assuming that cross-region connectivity requires a VPN or dedicated line, but AWS provides a native, managed peering feature that is simpler and more performant for inter-region Transit Gateway connectivity.
Detailed technical explanation
How to think about this question
Transit Gateway peering attachments use the AWS global network infrastructure to route traffic between Transit Gateways, with traffic staying within the AWS backbone and never traversing the public internet. The peering attachment supports transitive routing: routes from VPCs attached to one Transit Gateway can be propagated to the other Transit Gateway via static or dynamic route tables, enabling any-to-any connectivity across regions. In real-world scenarios, this is ideal for multi-region architectures where low-latency inter-region communication is critical, such as disaster recovery or global application deployments.
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.
Design Solutions for Organizational Complexity — This question tests Design Solutions for Organizational Complexity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use Transit Gateway peering attachments between Transit Gateways in different regions. — Transit Gateway peering attachments enable transitive routing between Transit Gateways in different AWS regions, providing low-latency connectivity over the AWS global network without requiring VPN or Direct Connect. This solution minimizes operational overhead because AWS manages the peering connection and route propagation automatically, allowing VPCs attached to different Transit Gateways to communicate across regions.
What should I do if I get this SAP-C02 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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