What are VLANs? -- the simplest explanation

This is the video version of the content of this article:
https://www.practicalnetworking.net/stand-alone/vlans/

Did you like the illustrations and animations in this video? Most of them are available for download for free in the article above.

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

Studying for a Networking certification like the Net+ or CCNA? If so, check out http://pracnet.net/ccna

Think you understand VLANs? Test yourself against the VLAN Challenge:
https://www.practicalnetworking.net/stand-alone/vlans/#challenge

What happens when there is a Native VLAN mismatch?
https://www.practicalnetworking.net/stand-alone/vlans/#native-vlan

Understand Address Resolution Protocol (ARP) in less than 5 minutes:
https://www.youtube.com/watch?v=QPi5Nvxaosw

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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

Видео What are VLANs? -- the simplest explanation канала Practical Networking