| Identity | One forest, few domains; Entra ID for cloud apps; hybrid join | 1 forest, 1 domain, Entra Connect to a developer tenant |
| Directory HA | 2+ domain controllers per site, AD-integrated DNS, documented FSMO | 2 DCs; transfer and seize FSMO once in the lab |
| Sites | AD sites match WAN/LAN; RODC at branches | 2 sites, 1 RODC, a site-linked GPO |
| Privilege | Tier 0/1/2, privileged access workstation, no daily Domain Admin | Separate admin OU, LAPS, a jump box |
| PKI | Offline root plus issuing CA | 1 enterprise CA; HTTPS and LDAPS |
| Compute | Hyper-V failover cluster or HCI | 2-node Hyper-V with live migration |
| File | DFS Namespace and replication, or a file cluster | DFS-N, shadow copies, a tested restore |
| Patch / endpoint | Intune or MECM with ringed rollouts | WSUS rings: pilot, then broad |
| Security | ASR, Credential Guard, Defender XDR, SIEM | Audit GPOs, event forwarding, attack-path discussion |
| Hybrid / DR | Azure Arc, Site Recovery, 3-2-1 backup, written RPO/RTO | Backup to a second disk; restore a DC and a file share |
| Ops | Change records, runbooks, monitoring SLOs | One-page runbook and a “DC down” drill |