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Question 25 of 198
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A/ but https://docs.aws.amazon.com/directconnect/latest/UserGuide/limits.html mention VPGs (VPCs) per DX GW is 20. The company have 120 VPCs spread across 3 region (40 per region) > 20 ... B/ TGW is regional. C/ cost for maintainance (manage tgw routing) but it's work. D/ Transitive routing is not available VPC peering (On-premise - AWS).
There are 120 VPC's in each region. That being said, option A where a single Direct Connect gateway connect to all the VPCs via private VIF's (adnd VGW of course)..simply does not work. DxGW can only connect to 20 Virtual private gateways per AWS Direct Connect gateway. https://docs.aws.amazon.com/directconnect/latest/UserGuide/limits.html Had it had TGW connected to DxGW, it would've been the best choice in terms of sufficient bandwidth. C is the answer.
Simplifying Network Architecture: By using a single transit gateway, the company can centralize its VPN connections, reducing the complexity associated with managing multiple VPN tunnels directly attached to each VPC. Resilient Connectivity: The transit gateway can provide a more scalable and resilient solution for connectivity between AWS and the on-premises data centers. Sharing Resources with AWS RAM: Using AWS Resource Access Manager (AWS RAM) to share the transit gateway across accounts helps in maintaining a centralized and standardized architecture. Scalability: The transit gateway can handle the additional 2 Gbps of traffic per region and is designed to scale as traffic increases over time. This solution offers a more centralized and scalable approach, reducing management overhead and providing the flexibility needed for future growth.