ANS-C01 Question 137
Single answerYou are designing a highly available and scalable AWS network architecture for a global application that requires communication between multiple VPCs across different AWS Regions. The architecture must automatically adapt to changes in the network, such as the addition or removal of VPCs, and minimize operational overhead. Which routing strategy should you implement?
- A
Use static routes in each VPC's route table to manually establish communication between VPCs.
- B
Use AWS Transit Gateway with Border Gateway Protocol (BGP) for dynamic routing between VPCs.
- C
Use VPC peering connections with static routes to connect all VPCs across regions.
- D
Use AWS Direct Connect to create private connections between VPCs and rely on static routes.
Show answer and explanation
Correct answer: B
Explanation
To design a scalable and highly available global network architecture, AWS Transit Gateway with BGP is the best choice. It supports dynamic routing, which automatically adapts to changes in the network, and simplifies connectivity between multiple VPCs across regions. This minimizes operational overhead compared to static routing or VPC peering, which are less scalable and require manual updates.
- A. Incorrect.
Static routes require manual configuration and do not automatically adapt to changes, making them impractical for a dynamic, scalable architecture.
- B. Correct.
AWS Transit Gateway with BGP enables dynamic routing and simplifies communication across VPCs. BGP allows routing to adapt to changes, such as adding or removing VPCs, with minimal operational overhead.
- C. Incorrect.
VPC peering with static routes is not scalable for a global application with multiple VPCs, as it requires point-to-point connections and manual route updates.
- D. Incorrect.
AWS Direct Connect is used for creating private connections between on-premises and AWS, not for routing between VPCs. It also does not support dynamic routing between VPCs.