AWS Certified Solutions Architect – Associate (SAA-C02) — Question 409

A company has two VPCs that are located in the us-west-2 Region within the same AWS account. The company needs to allow network traffic between these
VPCs. Approximately 500 GB of data transfer will occur between the VPCs each month.
What is the MOST cost-effective solution to connect these VPCs?

Answer options

• A. Implement AWS Transit Gateway to connect the VPCs. Update the route tables of each VPC to use the transit gateway for inter-VPC communication.
• B. 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.
• C. 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.
• D. 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.

Correct answer: C

Explanation

VPC peering is the most cost-effective solution because it does not charge any hourly base fees, meaning you only pay for the data transferred between the VPCs. In contrast, AWS Transit Gateway, AWS Site-to-Site VPN, and AWS Direct Connect all incur ongoing hourly port or connection fees in addition to data processing charges, making them much more expensive for connecting just two VPCs.