Microsegmentation
Microsegmentation is a network security technique that divides infrastructure into small, isolated segments with individual security policies. Microsegmentation limits attacker lateral movement and is a key element of Zero Trust architecture.
What is Microsegmentation?
Microsegmentation Definition
Microsegmentation is an advanced network security technique that divides infrastructure into granular segments - down to individual workloads or applications. Each segment has its own security policies, drastically limiting an attacker’s lateral movement capabilities.
Microsegmentation vs Traditional Segmentation
Traditional segmentation (VLAN):
- Network-level segmentation
- IP/subnet-based boundaries
- Coarse-grained control
- Firewall at segment edge
Microsegmentation:
- Workload-level segmentation
- Application identity-based boundaries
- Fine-grained control
- Policies embedded in infrastructure
How Microsegmentation Works
- Discovery: Mapping communication between applications
- Classification: Grouping workloads by function
- Policy definition: Specifying allowed communication
- Enforcement: Enforcing policies at host level
- Monitoring: Continuous observation and alerting
Implementation Methods
- Agent-based: Agents on hosts enforce policies
- Network-based: SDN and virtual firewalls
- Hypervisor-based: Policies at hypervisor level
- Cloud-native: Security groups, NSGs in cloud
Microsegmentation Benefits
- Limiting lateral movement: Attacker cannot spread
- Reducing blast radius: Compromise affects only segment
- Visibility: Full East-West traffic visibility
- Compliance: Easier regulated environment separation
- Zero Trust: Foundation of Zero Trust architecture
Implementation Challenges
- Complexity: Requires accurate dependency mapping
- Legacy applications: Difficulties with legacy apps
- Operations: Requires continuous policy management
- Initial effort: Time-consuming discovery and classification
Microsegmentation in Zero Trust
Microsegmentation implements a key Zero Trust principle - “never trust, always verify” for internal traffic. Instead of implicitly trusting traffic within the network, every communication is verified.
Microsegmentation is an evolution of network security, essential for protecting modern hybrid and multi-cloud environments.