
AWS Certified Advanced Networking – Specialty (ANS-C01) Certification Guide
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AWS created Direct Connect gateways (DXGWs) to solve a limitation in private VIF architecture. Specifically, a DXGW allows you to overcome two very specific limits:
The DXGW allows a private VIF in one AWS region to attach to VPCs in another AWS region and extends the number of VPCs that can be attached to a single private VIF to 10 instead of just one. The DXGW is a global construct not tied to any region, which is what allows this cross-region DX connectivity. A DXGW in this type of deployment works like a network switch, extending DX and VIF outside of their normal limitations.
Here is a diagram of a basic DXGW deployment with private VIFs extended to other regions and VPCs:
Figure 4.10: Direct Connect gateway and private VIF
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