Zero Trust in practice with Entra ID and Defender
Zero Trust means never assuming trust based on network location - every access is verified. In practice for an SME: enforce MFA, apply conditional access in Entra ID, protect identities and endpoints with Microsoft Defender, and cut standing privileges. Start with MFA everywhere.
What Zero Trust actually means
Three principles: verify explicitly, use least privilege, and assume breach. It is a model, not a product - you apply it with tools you likely already own on Microsoft 365.
Step 1 - MFA everywhere
Multi-factor authentication is the single highest-impact control. Enforce it for every user and especially every admin, and block legacy authentication that bypasses it.
Step 2 - Conditional Access (Entra ID)
Add policies based on device compliance, sign-in risk and location, so access adapts to context instead of being all-or-nothing.
Step 3 - Defender for identities and endpoints
Microsoft Defender detects and responds to risky sign-ins and compromised devices, with automated response for the obvious cases.
Step 4 - Least privilege
Remove standing admin rights and grant elevated access just-in-time. Most damage comes from over-privileged accounts, not clever attacks.
FAQ
Is Zero Trust only for big companies?
No - the core steps (MFA, conditional access) are well within reach for SMEs on Microsoft 365.
Where do I start?
Enforce MFA for everyone, then block legacy authentication.
Do I need extra licences?
Some features need Entra ID P1/P2 or a Defender plan; basic MFA is widely available.
WRITTEN BY
The Effict Labs practice
Effict & CloudTechneut — practical AI, process and cloud, written from real client projects.
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