What is the MOST cost-effective solution to connect these VPCs?
Implement AWS Transit Gateway to connect the VPCs. Update the route tables of each VPC to use the transit gateway for inter-VPC communication.
Implement an AWS Site-to-Site VPN tunnel between the VPCs. Update the route tables of each VPC to use the VPN tunnel for inter-VPC communication.
Set up a VPC peering connection between the VPCs. Update the route tables of each VPC to use the VPC peering connection for inter-VPC communication.
Set up a 1 GB AWS Direct Connect connection between the VPCs. Update the route tables of each VPC to use the Direct Connect connection for inter-VPC communication.
Explanations:
AWS Transit Gateway is a scalable solution but may be overkill for just two VPCs. It also introduces additional costs for the transit gateway itself, making it less cost-effective compared to other options.
A Site-to-Site VPN is typically used for connecting on-premises networks to AWS, not for inter-VPC communication. VPN costs can be higher, and the throughput might be insufficient for 500 GB of data transfer each month.
VPC Peering is the most cost-effective solution for connecting two VPCs in the same region. It provides low-latency, high-bandwidth communication with minimal setup costs. The data transfer cost is also lower than other solutions.
AWS Direct Connect is an expensive option designed for high-throughput, low-latency connections to AWS from on-premises networks. It is not cost-effective for inter-VPC communication in the same region, especially with only 500 GB of data transfer.
If I’m correct, the answer is:
Set up a VPC peering connection between the VPCs. Update the route tables of each VPC to use the VPC peering connection for inter-VPC communication.