A Vlan is a lot like a food for your kids, Carl. When your kids are eating you probably noticed they don't like to eat potatoes with their peas mixed in so they sometimes separate the foods with their spoon or hand or fork. A Vlan also works as a divider stopping certain traffic from talking to other traffic. It also stops a break in one Vlan( Virtual-Lan) from messing up the other Vlans usually, similarly if your kids let all their food touch they would have a meltdown, Carl. A full network down is a lot worse than just part of the network being down, just like if the peas touch the potatoes, but the beef roast was still safe. If that were to happen your kid could still eat something, and if the one Vlan broke the other Vlans, typically, won't break as well and can still be salvaged! This is how the vlan domains work, at layer 2... This changes a bit once we introduce inter-Vlan routing, or kids matching specific food! I hope this helps Carl!
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