For a private on-premises-to-GCP connection requiring at least 20 Gbps and following Google best practices, how should you set up networking?

Dedicated Interconnect is the correct choice for high-bandwidth, private connections between on-premises environments and Google Cloud, supporting speeds up to 100 Gbps per connection, easily meeting the 20 Gbps requirement. It offers lower latency and higher throughput than VPN. A Virtual Private Cloud (VPC) is essential as it provides the isolated network environment within Google Cloud for your resources. A single Cloud VPN connection typically offers up to 1.5 Gbps per tunnel, which is insufficient for 20 Gbps. While multiple VPN tunnels can be aggregated, it's generally not the best practice for such high throughput requirements compared to Dedicated Interconnect. Cloud CDN is a content delivery network for serving web content to users, not a solution for private network connectivity between on-premises and GCP.