### Why Enterprise Environments Use Hub-and-Spoke
As cloud adoption grows across an enterprise, isolating environments (Development, Staging, Production, Shared Services) becomes essential. The Hub-and-Spoke network topology provides:
1. **Centralized Security Management**: A single inspection point for all ingress, egress, and cross-env traffic. 2. **Cost Efficiency**: Shared services like ExpressRoute circuits, VPN gateways, and central DNS servers are placed in the Hub VNet rather than duplicated across spokes. 3. **Workload Isolation**: Spokes remain isolated from each other unless explicitly routed through central firewall inspection.
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