Network segmentation divides networks into zones with restricted traffic between zones. Segmentation limits lateral movement by attackers. A compromised system in one zone cannot access other zones.

Segmentation Strategy

Identify critical assets requiring protection: financial systems, customer data, intellectual property. Create separate network zones for these assets. Restrict traffic between zones using firewalls.

Implement zero trust principles: verify every access request regardless of source. Users and devices must authenticate and be authorized for each resource.

"Network segmentation reduces breach impact by 80% by limiting lateral movement"

Implementation

Use VLANs to create logical network segments. VLANs separate traffic at layer 2, preventing direct communication between segments. Firewalls between VLANs enforce access policies.

Implement microsegmentation for additional protection. Microsegmentation creates very small zones, sometimes down to individual systems. This provides maximum protection but requires careful planning.

Segmentation Steps

Access Control

Implement least privilege access: users and systems have only the permissions needed for their role. Regularly audit access and remove unnecessary permissions.

Implement multi-factor authentication for access to sensitive zones. Require approval for access to critical systems. Log all access for audit trails.

Monitoring

Monitor traffic between segments to detect unauthorized access attempts. Alert on suspicious traffic patterns. Investigate and respond to unauthorized access attempts.