ANS-C01 Question 153
Single answerYou are designing a multi-region application deployment for a company using Amazon VPCs in each region. The application components communicate with each other using private IP addresses, and you need to ensure secure, seamless communication across regions without modifying the application. Which solution would allow you to achieve this using an overlay network?
- A
Use AWS Transit Gateway with inter-region peering and configure BGP to handle routing.
- B
Deploy a third-party VPN appliance in each region and establish site-to-site VPN connections between regions.
- C
Use AWS Cloud WAN to create a global network and enable cross-region communication.
- D
Use AWS VPC Lattice to establish service-to-service connectivity across regions.
Show answer and explanation
Correct answer: C
Explanation
An overlay network is a virtual network that runs on top of an existing network, abstracting the underlying physical infrastructure. AWS Cloud WAN enables a global network overlay by connecting VPCs across regions, providing secure, scalable, and simplified cross-region communication. It is the most appropriate AWS-native solution for creating an overlay network in this scenario.
- A. Incorrect.
AWS Transit Gateway with inter-region peering provides connectivity across regions, but it is not considered an overlay network. It operates at the network layer without encapsulating traffic into an additional layer.
- B. Incorrect.
Third-party VPN appliances can create an overlay network using VPN tunnels, but this requires significant operational overhead and management, making it suboptimal for AWS-native solutions.
- C. Correct.
AWS Cloud WAN is designed to create a global, unified network overlay for AWS environments, seamlessly connecting VPCs across regions while abstracting the complexity of routing and security.
- D. Incorrect.
AWS VPC Lattice facilitates application-layer service-to-service connectivity within and across regions, but it does not operate as a network-layer overlay like Cloud WAN.