Traditional VLAN segmentation stops at the rack. Microsegmentation pushes security policies down to the individual workload or VM level, enforcing Zero Trust principles east-west within the data center, regardless of the underlying physical topology.
SDN controllers (like VMware NSX or Cisco ACI) decouple the control plane from the data plane. Security policies are attached to the workload's UUID, meaning the firewall rules follow the VM automatically as it migrates between hosts.
💡 Pro-tip: Define microsegmentation policies based on application tags (e.g., 'App=Web', 'Tier=DB') rather than IP addresses. This makes the policy immune to IP changes and automation scripts.
This command applies a strict rule allowing only MySQL traffic between the Web and Database tiers, blocking all other lateral movement between those workloads.
In a Zero Trust model, the internal network is assumed to be hostile. Microsegmentation ensures that even if an attacker compromises a web server, they cannot ping, SSH, or exploit the database server sitting on the exact same physical hypervisor.
⚠️ Microsegmentation requires deep visibility into application dependencies. Deploying rules without proper flow mapping will instantly break production applications and cause massive outages.
| Scope | Technology | Enforcement Point |
|---|---|---|
| Macro (VLAN) | Physical Switch | Router/Switch ACL |
| Micro (Workload) | SDN / Hypervisor | vNIC / Virtual Switch |
| Host | Endpoint Agent | Local OS Firewall |
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