For two virtual networks to share resources over Azure backbone, what is the recommended action?

To enable two virtual networks to share resources over the Azure backbone, configuring VNet peering is the recommended action. VNet peering establishes a direct connection between two virtual networks, which allows them to communicate with one another as if they were in the same network.

This setup provides low-latency and high-bandwidth connectivity since the data travels over Azure's internal backbone. Additionally, VNet peering can connect virtual networks across different Azure regions, facilitating cross-region communication. Importantly, when peered, the virtual networks can share resources like virtual machines, storage accounts, and more, reinforcing the collaborative capabilities of services within the Azure environment.

The other options do not provide the same level of seamless connectivity as VNet peering. A private zone in Azure DNS relates to name resolution rather than resource sharing. A VNet-to-VNet VPN connection introduces additional latency and complexity since it relies on VPN gateways and is often used for on-premises to VNet connections or connecting virtual networks over the public internet. Adding a service endpoint enhances connectivity but is primarily for securing access to Azure services within a VNet rather than directly linking two VNets for resource sharing. Thus, configuring VNet peering stands out as the most efficient and effective method for