What’s VLAN?

If you work as an engineer and have a lot of opportunities to deal with NW, you may have heard the word “VLAN”. However what’s the VLAN meaning?

In this article, I’ll explain about VLAN in simple terms.


VLAN is the technology to construct virtual LAN segment unlike usual LAN. Specifically, VLAN divide the broadcast domain on L2SW virtually and limit the range of direct communication.


Moreover, when we use VLAN we don’t have to change physical cables to build the network.


The merits of VLAN are below.

  1. Not dependent on physical cables or NW devices
  2. We can configure the policy or QoS for each LAN
  3. The amount of traffic decrease


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