The correct answer is to use an AWS Transit Gateway in a central network account and attach all VPCs from the various accounts. This design is correct because Transit Gateway acts as a cloud router, providing a single, scalable hub for transitive routing between VPCs and on-premises networks, while placing it in a central network account and sharing it via AWS Resource Access Manager minimizes operational overhead by decoupling network management from individual workload accounts. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of centralized multi-account connectivity patterns, often appearing as a trap where you must avoid proposing VPC peering (which creates a non-scalable mesh) or a single-account Transit Gateway that lacks cross-account sharing. The key memory tip is “Hub and Share”: the Transit Gateway is the hub in the central account, and RAM is the mechanism to share it—never peer when you can centralize.
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 large enterprise is migrating to AWS and wants to implement a multi-account strategy with centralized network connectivity. The company has multiple VPCs in various accounts that need to communicate with each other and with on-premises resources. The solution must be scalable and minimize operational overhead. Which design should be used?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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 in a central network account and attach all VPCs from the various accounts.
Option D is correct because AWS Transit Gateway acts as a central hub for interconnecting VPCs and on-premises networks, enabling scalable, low-operational-overhead connectivity across multiple accounts. By placing the Transit Gateway in a central network account and using AWS Resource Access Manager to share it with other accounts, the enterprise can avoid the complexity of managing many individual connections while supporting transitive routing and centralized control.
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 AWS PrivateLink to connect VPCs via interface endpoints.
Why it's wrong here
PrivateLink is for accessing services, not full network connectivity.
✗
Create a VPC peering connection between each pair of VPCs that need to communicate.
Why it's wrong here
VPC peering is not transitive and becomes complex with many VPCs.
✗
Set up a VPN connection from each VPC to the on-premises network and use routing to enable inter-VPC communication.
Why it's wrong here
This creates a complex routing setup and doesn't scale.
✓
Use an AWS Transit Gateway in a central network account and attach all VPCs from the various accounts.
The clue word "minimum / minimize" in the question point toward this answer.
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 often confuse AWS PrivateLink (which is for service-to-service communication) with a hub-and-spoke solution, or assume VPC peering can scale linearly, ignoring the lack of transitive routing and the operational burden of managing a full mesh.
Detailed technical explanation
How to think about this question
AWS Transit Gateway uses a single network appliance in a central account that can be shared via AWS RAM, supporting up to 5000 VPC attachments per gateway and 50 Gbps per attachment (burstable to higher). It leverages a routing table per attachment to isolate traffic and supports multicast, IPsecVPN, and Direct Connect integration, making it ideal for large-scale, multi-account architectures where transitive routing and centralized management are required.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 an AWS Transit Gateway in a central network account and attach all VPCs from the various accounts. — Option D is correct because AWS Transit Gateway acts as a central hub for interconnecting VPCs and on-premises networks, enabling scalable, low-operational-overhead connectivity across multiple accounts. By placing the Transit Gateway in a central network account and using AWS Resource Access Manager to share it with other accounts, the enterprise can avoid the complexity of managing many individual connections while supporting transitive routing and centralized control.
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.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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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