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🔒 '''Network segmentation''' is a cybersecurity architecture practice — and a key [[Definition:Risk mitigation | risk mitigation]] control evaluated by [[Definition:Cyber insurance | cyber insurance]] [[Definition:Underwriter | underwriters]] — in which an organization's computer network is divided into distinct zones or subnets, each with its own access controls, so that a breach in one segment cannot easily propagate across the entire environment. In the context of insurance, network segmentation has moved from being a technical best practice to a material [[Definition:Underwriting | underwriting]] consideration: carriers increasingly require or incentivize it through [[Definition:Premium | premium]] credits, more favorable [[Definition:Deductible | deductibles]], or broader coverage terms, recognizing that segmented networks dramatically reduce the blast radius of [[Definition:Ransomware | ransomware]] attacks and other intrusion events.

⚙️ From an operational standpoint, network segmentation works by establishing barriers — firewalls, virtual local area networks (VLANs), access control lists, and zero-trust micro-segmentation architectures — between different parts of an organization's IT infrastructure. A hospital, for example, might isolate its medical device network from its billing system and both from its administrative email servers. If ransomware compromises the email environment, the segmentation prevents lateral movement into systems containing protected health information or operational technology. Cyber insurance application questionnaires now routinely ask about segmentation practices, and sophisticated [[Definition:Managing general agent (MGA) | MGAs]] and carriers use technical scanning tools to verify that claimed segmentation actually exists before binding coverage. The presence or absence of effective segmentation can influence not only pricing but also whether a [[Definition:Claim | claim]] is covered — particularly when [[Definition:Policy exclusion | policy language]] conditions coverage on the maintenance of declared security controls.

🛡️ The significance of network segmentation to the insurance industry has grown sharply since the major [[Definition:Ransomware | ransomware]] waves of the late 2010s and early 2020s, which demonstrated that flat, unsegmented networks could be compromised entirely within hours. High-profile incidents — including attacks on healthcare systems, municipal governments, and multinational manufacturers — revealed that the absence of segmentation was a common factor in catastrophic [[Definition:Loss | losses]]. As a result, leading cyber underwriters in markets ranging from [[Definition:Lloyd's of London | Lloyd's]] to the U.S. surplus lines market now treat segmentation as a baseline hygiene requirement, analogous to fire sprinklers in [[Definition:Property insurance | property insurance]]. For [[Definition:Insurtech | insurtech]] companies building cyber products, the ability to assess segmentation posture through automated external scanning or integration with endpoint detection platforms represents a competitive advantage in both [[Definition:Risk selection | risk selection]] and post-bind [[Definition:Loss prevention | loss prevention]] services.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Cyber insurance]]
* [[Definition:Ransomware]]
* [[Definition:Risk mitigation]]
* [[Definition:Cybersecurity control]]
* [[Definition:Zero-trust architecture]]
* [[Definition:Loss prevention]]
{{Div col end}}

Definition:Network segmentation - Revision history

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