There are 2 Squirrels running down a pipe, they get in each others way, slowing each other down one tries to steal the other ones food its just Chaos. Now if we tag each Squirrel with a Vlan, they are both still in the same pipe, but they can't see each other they don't get in each others way and they cannot hop in to each others path. The end up where they are supposed to go with out ever interacting with each other. The only way for them too cross paths is if I allow it in the Tree branch Router . Does that Help you under stand vlans LOL.
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