AWS Certified Solutions Architect – Associate (SAA-C03)Design Cost-Optimized ArchitecturesHard
A global e-commerce company uses an AWS Transit Gateway to connect its numerous VPCs across multiple AWS Regions. They notice that data transfer costs between VPCs in different regions, routed through the Transit Gateway, are becoming significant. The company wants to optimize these costs while maintaining connectivity. Which networking solution should they consider?
- AEnable AWS Direct Connect Gateway for inter-region VPC communication.
- BUse VPC peering connections between all VPCs in different regions instead of Transit Gateway.
- CUtilize AWS Transit Gateway's inter-region peering feature.
- DConsolidate all VPCs into a single AWS Region to eliminate inter-region traffic.
Show answer & explanationAnswer & explanation
Correct answer: C. Utilize AWS Transit Gateway's inter-region peering feature.
AWS Transit Gateway's inter-region peering allows Transit Gateways in different regions to connect, routing traffic directly between them over the AWS global network. This eliminates the need for data to traverse the public internet or be routed through an on-premises datacenter, often resulting in lower data transfer costs and improved performance compared to other options for complex multi-region VPC connectivity.
Why the other options are wrong
- A. AWS Direct Connect Gateway is primarily used to connect on-premises networks to multiple VPCs in different regions. While it uses the AWS global network, it's not the direct solution for inter-region VPC-to-VPC communication solely within AWS.
- B. VPC peering connections are point-to-point and do not scale well for a large number of VPCs across multiple regions, leading to a complex mesh network and potentially higher management overhead than Transit Gateway.
- D. Consolidating all VPCs into a single region might eliminate inter-region traffic but could compromise latency for global users, reduce resilience, and might not be feasible for a 'global e-commerce company' with data residency requirements.
AWS Transit Gateway Inter-Region Peering
AWS Transit Gateway inter-region peering allows you to connect Transit Gateways in different AWS Regions, enabling network traffic to route between them.
- Extends Transit Gateway's capabilities across AWS Regions.
- Uses the highly available, low-latency AWS global network.
- Simplifies complex multi-region network architectures.
- Can reduce inter-region data transfer costs compared to other methods.
Memory trick: Transit Gateways Peer, Costs Disappear.