VLAN in a simple word is two separate networks within one network. Meaning let's say you have different departments in your company such as Finance, Management, Marketing and Sales and you don't want the Salespeople to access the Computers on the Finance network, so you create two VLANs for those departments. Or let's say you have a wifi network that your entire company connects to but you want to have a guest wifi network for your visitors that is separated from your corporate wifi network, so you set your guest wifi network on another VLAN.
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