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VLANs – the simplest explanation

I just released a new videos which teaches VLANs in the absolute simplest way. This is how I wish VLANs were taught to me when I first started my Networking journey. I have since taught countless students using this format, and the reception has been unanimously positive. Now I’m sharing that method with my readers!

What are VLANs - Youtube video from Practical Networking .net

The video discusses through the following concepts:

  • VLANs provide two major functions:
    • Break up physical switches into virtual “mini switches“
    • Extend the virtual “mini switch” to multiple physical switches
  • VLANs allow your Logical topology to be unconstrained by your Physical topology
  • Access Ports / Untagged Ports – ports which carry traffic for only ONE VLAN
  • Trunk Ports / Tagged Ports – ports which carry traffic for MULTIPLE VLANs
    • All frames traversing a Trunk port must be “tagged” so the receiving switch knows what VLAN to associate that traffic to
  • 802.1q – open standard for how to tag Layer 2 frames
  • Native VLAN – The one VLAN which traverses a Trunk/Tagged link without a VLAN tag

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