Learn how to implement the highest performance solution for connectivity between multiple VPCs using a AWS Transit Gateway for aggregation and improved throughput over peering or VPN-based options.
Table of Contents
Question
A company has three VPCs in a single AWS Region. Each VPC contains 15 Amazon EC2 instances, and no connectivity exists between the VPCs.
The company is deploying a new application across all three VPCs. The application requires high bandwidth between the nodes. A network engineer must implement connectivity between the VPCs.
Which solution will meet these requirements with the HIGHEST throughput?
A. Configure a transit gateway. Attach each VPC to the transit gateway. Configure static routing in each VPC to route traffic to the transit gateway.
B. Configure VPC peering between the three VPCs. Configure static routing to route traffic between the three VPCs.
C. Configure a transit VPConfigure a VPN gateway in each VPCreate an AWS Site-to-Site VPN tunnel from each VPC to the transit VPUse BGP routing to route traffic between the VPCs and the transit VPC.
D. Configure AWS Site-to-Site VPN connections between each VPC. Enable route propagation for each Site-to-Site VPN connection to route traffic between the VPCs.
Answer
A. Configure a transit gateway. Attach each VPC to the transit gateway. Configure static routing in each VPC to route traffic to the transit gateway.
Explanation
A transit gateway is a purpose-built gateway for inter-VPC connectivity with higher network throughput compared to other options.
VPC peering (B) provides lower throughput as each peering connection has its own bandwidth limitation.
Multiple VPN connections (C, D) add processing overhead at each VPN endpoint versus a single transit gateway endpoint.
By aggregating all VPC connectivity through a single transit gateway, option A allows the highest total network capacity for the application traffic between the VPCs.
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