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configuring-network-segmentation-with-vlans

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'Designs and implements VLAN-based (802.1Q) network segmentation on

When to use

• Segmenting an enterprise network into isolated security zones (corporate, servers, DMZ, guest, IoT)
• Meeting compliance requirements (PCI-DSS, HIPAA, SOC 2) that mandate network isolation for sensitive data
• Reducing blast radius of security incidents by preventing lateral movement between network segments
• Isolating high-risk devices (IoT, BYOD, legacy systems) from critical infrastructure
• Implementing defense-in-depth by combining VLANs with firewall rules and access control lists

When not to use

• Using VLANs as the sole security control without Layer 3 filtering
• Isolating networks that require air-gapping
• Configuring without proper switch hardening against VLAN hopping attacks

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