Microsegmentation
Microsegmentation is a network security technique that divides infrastructure into small, isolated segments with individual security policies. It limits attacker lateral movement and is a key element of Zero Trust architecture.
What is Microsegmentation?
Microsegmentation is a network security technique that divides infrastructure into granular segments down to individual workloads — each with its own access policies. It drastically limits attacker lateral movement. Unlike VLAN (subnet-level segmentation), microsegmentation works at application-identity level (tags, labels). Foundation of Zero Trust architecture.
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.
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Frequently asked questions
+ What is microsegmentation?
Microsegmentation is an advanced network security technique that divides infrastructure into granular segments — down to individual workloads or applications. Each segment has its own access policies, drastically limiting attacker lateral movement. It is the foundation of Zero Trust architecture: 'never trust, always verify' for East-West (internal) traffic.
+ How does microsegmentation differ from VLAN?
VLAN divides networks coarsely — all servers in a subnet can communicate freely. Microsegmentation isolates each workload individually: even servers in the same subnet must pass through access policies. VLAN is IP/subnet-based; microsegmentation is application-identity based (tags, labels, metadata). Effect: attack on one server does not grant access to the others in the segment.
+ What are the implementation methods for microsegmentation?
4 main methods: (1) Agent-based — agent on each host enforces policies (Illumio, Guardicore/Akamai, Elisity), (2) Network-based — SDN and virtual firewalls (VMware NSX, Cisco ACI), (3) Hypervisor-based — policies at hypervisor level (VMware vSphere Distributed Firewall), (4) Cloud-native — AWS Security Groups, Azure NSG, GCP Firewall Rules. Choice depends on environment: on-prem vs hybrid vs cloud.
+ Which vendors offer microsegmentation?
Market leaders 2024-2026: (1) Illumio Core — agent-based, enterprise, (2) Guardicore Centra (Akamai) — hybrid cloud, (3) VMware NSX — vSphere/cloud, (4) Cisco Secure Workload (Tetration) — advanced analytics, (5) Elisity — cloud-native SaaS, (6) Zscaler Private Access — ZTNA with segmentation. Cloud-native: AWS VPC + Security Groups, Azure NSG, GCP Firewall Rules. Selection by environment: on-prem enterprise → Illumio/Guardicore, vSphere → NSX, hybrid → Illumio/Guardicore, pure cloud → native.
+ How to implement microsegmentation — roadmap
5 steps (typical project 6-18 months): (1) Discovery — mapping East-West communication (Illumio Maps, Guardicore Reveal, network flow logs), (2) Workload classification — tagging, application dependency mapping, (3) Policy design — default deny + explicit allow, grouping per application, (4) Enforcement in monitor mode (log only) → simulate → enforce (gradual), (5) Operations — continuous policy tuning, change management, CMDB integration. Biggest risk: breaking legacy apps without full discovery.