Episode 29 — Segmentation Fundamentals: why segmentation fails and how to make it stick
Segmentation is a foundational security and resilience strategy in CloudNetX scenarios, but it frequently fails in real environments due to unclear requirements and unmanaged exceptions. This episode defines segmentation as the practice of separating assets into groups with controlled, explicitly allowed flows, with the goal of limiting blast radius and simplifying enforcement. The first paragraph explains why segmentation fails: teams do not map flows before writing rules, ownership is unclear, shared services and dependencies are not accounted for, and “temporary” exceptions accumulate until the segmentation boundary is meaningless. It also describes segmentation as a design discipline, not a one-time configuration task, requiring clear intent, strong documentation, and consistent enforcement points such as VLANs, ACLs, firewalls, security groups, or workload policies.
