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VLAN is a Virtual Local Area Network
That is a LAN network that is virtually created on a switch. On a standard switch it will usually forward traffic from one port to all other ports when there is traffic with the same broadcast domain passing through that port.
For special switches, they are able to create several different LANs with different IDs on each port, and will only forward traffic to ports that have the same ID.
This special switch type actually has automatically installed a VLAN in it (vlan id = 1) which consists of all existing ports.
Why is a VLAN needed?
It is also very important that this VLAN is used, that is, when your network becomes larger in scale and broadcast traffic becomes a burden on your entire network.
Too large a burden caused by broadcast traffic can cause your network to crash and not be as responsive as before.
When do VLANs need to be implemented?
You need a VLAN when your network conditions:
1. Having more than 200 device nodes in your network.
2. A lot of broadcast traffic happens on your network.
3. You want to divide some of your users into separate groups to increase security.
4. Reduce broadcast traffic that is mostly caused by virus attacks and other nuisance programs that will ravage your network.
5. Or you just want to make a few virtual switches from an existing switch.
Why not just use one subnet?
In the development of your network, it may require different treatment (VOIP network, server network, local network, different gateways) but it is still in the same infrastructure and location.
Or it could be the opposite, you have several devices that differ in infrastructure and location but are still in the same network segment (infrastructure sharing).
How can different VLAN devices communicate?
On different devices the VLAN will be able to communicate with each other through a router (routing protocol). Just as several different subnets communicate with each other with the help of a router.
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5 сен 2024
