**Hybrid Connections**: Relay-based connectivity from App Service/Function to on-prem. Uses Azure Relay; outbound from on-prem. **Limitations**: Max 100 connections per app. Not for high throughput—Relay adds latency. No VNet integration; not for large data movement. Each connection is point-to-point. **When to use**: Quick setup for low-volume access (e.g., call on-prem API). **When not**: High-throughput ETL, bulk copy. Use VNet integration + ExpressRoute/VPN for that....
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