Individual skill
configuring-network-segmentation-with-vlans
Designs and implements VLAN-based network segmentation on managed switches to isolate network zones, enforce access control between segments, and reduce the attack surface by limiting lateral movement paths in enterprise network environments.
internal/tools/skills/data/network-security/configuring-network-segmentation-with-vlans/SKILL.md
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- Last checked
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- cybersecurity Repository topic
- security Repository topic
- bug-bounty Repository topic
- automation Repository topic
- autonomous-pentesting Repository topic
- ai-agent Repository topic
- ai-security Repository topic
- ethical-hacking Repository topic
- golang Repository topic
- penetration-testing Repository topic
- network-security Declared skill tag
- vlan Declared skill tag
- network-segmentation Declared skill tag
- switch-security Declared skill tag
- 802.1q Declared skill tag
- security Derived category
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# Configuring Network Segmentation with VLANs
## 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
**Do not use** VLANs as the sole security control without Layer 3 filtering, for isolating networks that require air-gapping, or without proper switch hardening against VLAN hopping attacks.
## Common Misconfigurations & Verification
- **Native VLAN = VLAN 1 (or a used VLAN):** enables double-tagging hops. Set `switchport trunk native vlan 998` (an unused VLAN) on every trunk and verify with `show interfaces trunk` — the "Native vlan" column must show 998 on all trunks.