For a better understanding of virtual network peering, you need to consider the following key points:
- Peered virtual networks do not need any encryption, public internet, or event gateways, as they use the Microsoft backbone network.
- Using virtual network peering provides a low-latency, high bandwidth connection between the resources in each virtual network.
- Virtual network peering can be used to migrate resources from one subscription/region to another, because Microsoft Azure supports the concept of peering virtual networks in different subscriptions/regions.
Peering for virtual networks located in different regions is currently in preview and is only available for the following regions: US West Central, ...