This is the first in a series of three blog posts about network segmentation. Segmentation is the process of breaking a network into smaller networks. It aims to respond to the weaknesses of a flat network model, where everything is trusted. The danger with such a network model is that malicious actors could gain access to sensitive data by capitalizing on a single network intrusion and moving sideways. The benefits arent just in the security realm, they can shape traffic in such a way that reduces network congestion and thereby improve performance.”]
Source: https://securityintelligence.com/articles/what-is-network-segmentation/