AWS Certified Advanced Networking – Specialty (ANS-C01) — Question 66

An Australian ecommerce company hosts all of its services in the AWS Cloud and wants to expand its customer base to the United States (US). The company is targeting the western US for the expansion.
The company’s existing AWS architecture consists of four AWS accounts with multiple VPCs deployed in the ap-southeast-2 Region. All VPCs are attached to a transit gateway in ap-southeast-2. There are dedicated VPCs for each application service. The company also has VPCs for centralized security features such as proxies, firewalls, and logging.
The company plans to duplicate the infrastructure from ap-southeast-2 to the us-west-1 Region. A network engineer must establish connectivity between the various applications in the two Regions. The solution must maximize bandwidth, minimize latency and minimize operational overhead.
Which solution will meet these requirements?

Answer options

• A. Create VPN attachments between the two transit gateways. Configure the VPN attachments to use BGP routing between the two transit gateways.
• B. Peer the transit gateways in each Region. Configure routing between the two transit gateways for each Region's IP addresses.
• C. Create a VPN server in a VPC in each Region. Update the routing to point to the VPN servers for the IP addresses in alternate Regions.
• D. Attach the VPCs in us-west-1 to the transit gateway in ap-southeast-2.

Correct answer: B

Explanation

The correct answer is B because peering the transit gateways allows for efficient routing between the two Regions, ensuring optimal bandwidth and low latency. Options A and C involve more complex setups that could increase operational overhead, while option D does not provide the necessary inter-Region connectivity required for the applications.