Peering

Peering options interconnect (Direct, Carrier), VPN

.https://cloud.google.com/network-connectivity/docs/how-to/choose-product#typical-use-cases

	Dedicated Interconnect	Partner Interconnect
Features	A direct connection to Google. Traffic flows directly between networks, not through the public internet. 10-Gbps or 100-Gbps circuits with flexible VLAN attachment capacities from 50 Mbps to 50 Gbps.	More points of connectivity through one of our supported service providers. Traffic flows between networks through a service provider, not through the public internet. Flexible capacities from 50 Mbps to 50 Gbps.
Service providers		Connect to supported service providers, who provide more points of connectivity compared to the colocation facilities available for Dedicated Interconnect. Work with a supported service provider. If your service provider isn't supported, or if you don't want to pass traffic through a service provider, consider Cloud VPN or Dedicated Interconnect. Compared to Dedicated Interconnect, you don't need to install and maintain routing equipment in a colocation facility.

.https://cloud.google.com/network-connectivity/docs/carrier-peering

To access Google Workspace applications from an on-premises network, an organization might need a perimeter network to reach Google's network. The perimeter network enables organizations to expose an isolated subnetwork to the public internet instead of their entire network.

.https://cloud.google.com/network-connectivity/docs/direct-peering

Peering options - .https://peering.google.com/#/options/peering

Static, dynamic, peering routes - https://cloud.google.com/vpc/docs/routes#routeselection

VPC peering - https://cloud.google.com/vpc/docs/vpc-peering

Peered network with access to on-premises network