The concept of VLANs explained simply and illustrated effectively showing you the purpose and functionality of VLANs.

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Want to learn more about VLANs? Check out http://pracnet.net/vlans

Want to learn how to Configure VLANs?
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Want to see the Native VLAN in action?
   • Native VLAN  the DEFINITIVE illustra...  

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Think you understand VLANs? Test yourself against the VLAN Challenge:
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What happens when there is a Native VLAN mismatch?
https://www.practicalnetworking.net/s...

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   • Networking Fundamentals  

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00:00 Topology Intro
00:24 Splitting one Physical Switch into Virtual Switches
01:47 Extending Virtual Switches to other Physical Switches
03:19 Access Ports, Trunk Ports, Tagged Ports, Untagged Ports
04:46 VLAN Tags and 802.1q
06:55 Logical Topologies vs Physical Topologies
07:31 Native VLAN
10:20 Summary of what we've learned




Summary:

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

#vlans #networking #ccna