SAP-C02 Practice Question: Design Solutions for Organizational Complexity
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?
⚠ Common exam trap
Many exam-takers 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.
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 in a central network account and attach all VPCs from the various accounts.
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.
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.
Why this is correct
Transit Gateway provides scalable, transitive connectivity.
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Senior Network & Security Engineer · founder of Courseiva
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