Question

Your company is migrating a legacy web application to Google Cloud incrementally. During the transition, the application still runs on servers in your on-premises data center, which is reachable via Cloud Interconnect. You need to expose this on-premises application through a global external Application Load Balancer so you can gradually shift traffic to new Compute Engine backends and take advantage of Cloud CDN and Google-managed TLS certificates. Which backend configuration allows the load balancer to route traffic to the on-premises servers?

Accepted Answer

Create a hybrid connectivity network endpoint group (NEG) with endpoints specifying the on-premises IP addresses and ports, and add it to the backend service.

Answer

Create a zonal NEG of type GCE_VM_IP_PORT referencing the on-premises server IP addresses.

Answer

Create an unmanaged instance group containing the on-premises servers and attach it to the backend service.

Answer

Create a serverless NEG pointing to the on-premises application endpoint.