Why we use vlans in the different subnets, the subnets are independent so why??

I know it is a beginner question help me please

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    Commented Feb 19, 2018 at 3:58

1 Answer 1


Because VLANs provide layer-2 segregation while subnetting is layer-3.

Two different subnets on the same VLAN (broadcast domain) will still see all the broadcast frames for each.

  • Thanks, do you mean to prevent broadcast from other subnets?
    – Nina
    Commented May 6, 2017 at 12:15
  • No, I'm talking about broadcast frames in layer-2 and not broadcast packets in layer-3. Two different layer-3 subnets will both see all the broadcast frames if they're in the same VLAN because they share layer-2.
    – Alo
    Commented Dec 28, 2017 at 23:42

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