How do I implement a Zero Trust Architecture in an existing on-premise corporate network?

All answers to this question.

The core of Zero Trust is "never trust, always verify." You should start with Identity and Access Management (IAM). If you don't know exactly who is on your network, micro-segmentation won't help much. Integrate a strong IdP with Multi-Factor Authentication (MFA) across all applications. Once identity is verified, then move to micro-segmentation to divide the network into small, isolated zones. This ensures that even if one workstation is compromised, the attacker cannot easily jump to the HR or Finance servers. It’s a marathon, not a sprint, so start with your most critical assets first.

   Answered 2025-04-21 by Elena Rodriguez

Are you planning to use a Software-Defined Perimeter (SDP) to hide your internal resources from the public internet entirely while you transition?

   Answered 2025-04-24 by Mark Thompson

• SDP is a great addition. By using a "black cloud" approach, your services aren't even visible to scans until the user is authenticated. It works perfectly alongside micro-segmentation. If you combine these, you drastically reduce your attack surface. Just make sure your policy engine is robust enough to handle the dynamic nature of these connections without blocking legitimate work.

     Commented 2025-04-27 by David Miller

Don't forget about device health checks. Identity isn't enough; the device itself must be patched and compliant before it's granted access to sensitive zones.

   Answered 2025-04-29 by Jessica Taylor

• Great point, Jessica. A compromised admin account on an unpatched laptop is still a huge risk. Posture checking is a non-negotiable part of a true Zero Trust setup.

     Commented 2025-05-01 by Sarah Jenkins