Zero Trust is a security model that assumes no user or device is trustworthy by default — every access request is verified based on identity, device health, location, and least privilege, regardless of whether the user is "inside" the office network. It replaces the old perimeter-only mindset (castle-and-moat VPN) with continuous validation. Microsoft’s implementation combines Entra ID conditional access, Intune compliance, segmented networks, and logging to SIEM. Adopting Zero Trust is a journey: start with MFA everywhere, retire legacy VPN-only access to SaaS, micro-segment critical servers, and monitor sign-ins for anomalies.
