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A VLAN acts like a physical LAN, but it allows hosts to be grouped together in the same broadcast domain even if they are not connected to the same switch. 

Here are the main reasons why you should use VLANs in your network:
  • VLANs increase the number of broadcast domains while decreasing their size.
  • VLANs reduce security risks by reducing the number of hosts that receive copies of frames that the switches flood.
  • You can keep hosts that hold sensitive data on a separate VLAN to improve security.
  • You can create more flexible network designs that group users by department instead of by physical location.
  • Network changes are achieved with ease by just configuring a port into the appropriate VLAN.


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