VNet peering versus VNet-to-VNet connections
VNet peering and VNet-to-VNet both offer ways to connect VNets. But based on your specific scenario and needs, you might want to pick one over the other:
- VNet peering: This offers high-bandwidth, low-latency connections, which are useful in cross-region data replication and database failover scenarios. The traffic remains on the Microsoft backbone and is completely private; that's why customers with strict data security requirements prefer to use VNet peering, since public internet is not involved. There are also no extra hops because a gateway isn't used here, which ensures low-latency connections. You can peer up to 500 VNets to one VNet. The ingress and egress traffic is charged using VNet peering. In region/cross-region scenarios, VNet peering is recommended.
- VPN gateways: These provide a limited bandwidth connection and are useful in scenarios where encryption is needed, but bandwidth restrictions are tolerable...