Episode 27: VLANs — Segmenting the Network for Performance and Security
Virtual LANs, or VLANs, allow you to break a single switch into multiple logical networks. This episode explains what VLANs are, how they work, and why they’re essential in modern network design. You’ll learn how VLANs reduce broadcast traffic, isolate departments or device types, and enhance security by separating sensitive systems from general access.
We also explore how VLAN IDs are assigned, how trunk ports carry multiple VLANs across switches, and how VLAN tagging works through the 802.1Q standard. By understanding these core VLAN concepts, you’ll be better equipped to troubleshoot communication issues and design networks that scale effectively while maintaining security.
