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A security approach that creates fine-grained, isolated network segments to restrict east-west traffic and limit lateral movement.
DESCRIPTION
Microsegmentation divides networks into granular zones and enforces policies at workload or application levels. It limits lateral movement by controlling east-west traffic and aligning access with least privilege. Often implemented with SDN, host-based agents, or identity-aware controls, it complements Zero Trust architectures. Policies follow workloads across environments, including data centers and clouds. Effective microsegmentation requires accurate asset mapping, dependency discovery, and change management to avoid unintended blockages.
ALTERNATIVE DEFINITIONS
VMware
Micro-segmentation is the process of dividing the data center into distinct security segments down to the individual workload level.
Emphasizes workload-level segmentation in data centers.
Illumio
Microsegmentation is a security technique that partitions a network into smaller zones to isolate workloads and minimize lateral movement.
Highlights isolation and lateral movement prevention.
NIST SP 800-207
Zero trust architectures often employ micro-segmentation to reduce attack surfaces by limiting communications among resources.
Places microsegmentation within Zero Trust strategy.
RELATED TERMS
Zero Trust Network Segmentation Software-Defined Networking Firewall Access Control List Lateral Movement East-West Traffic Policy Enforcement Service Mesh Identity-Based Segmentation
COMPETING TERMS
Perimeter Security Macrosegmentation
KNOWLEDGE AREAS
Data Security Infrastructure Cloud
TARGET AUDIENCE
Security Architect Cybersecurity Engineer Chief Information Security Officer Cloud Architect DevOps Engineer IT Manager
EXTERNAL SOURCES
- Wikipedia - Microsegmentation (computer networking)
- NIST - Zero Trust architecture reference
- VMware - Vendor overview and guidance
- Microsoft - Azure segmentation guidance
TOP QUESTIONS
Why is Microsegmentation important for modern networks?
It reduces attack surface and limits lateral movement after compromise. It aligns access with least privilege and supports Zero Trust in hybrid environments.
Category: Relevancy
How does Microsegmentation differ from traditional segmentation?
Traditional segmentation isolates large zones; microsegmentation enforces fine-grained policies at workload or application levels, controlling east-west traffic precisely.
Category: Distinction
What’s required to implement Microsegmentation effectively?
Accurate inventory, dependency mapping, risk-based policy design, testing, and phased rollout. Automation helps maintain consistency across environments.
Category: Requirements
What are common Microsegmentation mistakes?
Overly aggressive rules causing outages, neglecting application dependencies, and lack of observability for policy impacts.
Category: Mistakes
What are the risks of Microsegmentation?
Operational complexity and misconfiguration can cause service disruptions. Poor change control may block critical communications.
Category: Risk
How does Microsegmentation support Zero Trust?
It enforces least privilege and verifies each east-west communication, aligning with Zero Trust’s distrust of implicit network trust.
Category: Governance
Which technologies enable Microsegmentation?
Software-defined networking, host agents, identity-aware policies, service mesh, and cloud-native network policies.
Category: Overview
How is Microsegmentation monitored?
Use flow telemetry, policy audit logs, and anomaly detection to validate segmentation effectiveness and catch unintended blocks.
Category: Observability
What hot topics exist around Microsegmentation?
Identity-based segmentation, adaptive policies with AI, and integrating microsegmentation into service mesh and cloud-native platforms.
Category: Topic