Combine subnet-level NSGs with a centralized Azure Firewall in a hub-spoke topology for defense-in-depth network filtering.
Zero Trust
Implement Zero Trust security with identity, devices, applications, networks, and continuous verification checklists.
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Separate servers, clients, management interfaces, and IoT/OT devices into VLANs with inter-VLAN firewall rules to contain lateral movement.
Require multi-factor authentication for all users and block legacy protocols (IMAP, POP, SMTP AUTH) that bypass MFA entirely.
Give Domain Admins and other Tier 0 operators a dedicated, locked-down workstation that never touches email, browsing, or productivity apps.
Separate Domain Admin, server admin, and workstation admin credentials into isolated tiers to block lateral movement and privilege escalation.