Network Segmentation: Limiting Lateral Movement

Flat network architectures remain one of the most common weaknesses in mid-market organizations. When an attacker gains initial access to a single endpoint, a flat network allows them to move laterally without restriction, accessing file servers, databases, administrative systems, and other critical infrastructure.

Network segmentation divides your network into isolated zones based on function, sensitivity, or trust level. This limits an attacker's ability to move laterally and contains the blast radius of a breach.

Key segmentation strategies:

• VLAN-based segmentation: Separate user workstations, servers, IoT devices, and guest networks into distinct VLANs
• Firewall micro-segmentation: Apply granular access control lists between segments
• Zero Trust network access: Authenticate and authorize every connection, regardless of network location
• Privileged network isolation: Place administrative interfaces and management planes on restricted segments
• Monitoring: Deploy network detection and response (NDR) to identify cross-segment anomalies

Realm Defense conducts network architecture reviews and designs segmentation strategies that balance security with operational efficiency.