Imagine the data your computers and phones send and receive are vehicles. Well these email "cars" and video "trucks" travel through streets and highways called networks. While we could have everyone drive on the same road to get to their destinations you can imagine how rush hour would be a 24 hour occurance. So we obviously want multiple roads to help keep traffic manageable and more efficient but buying new equipment and running new cabling every time business needs evolve/grow is expensive and unrealistic. Instead, Dave invented the means to create software defined roads through the physical equipment and cabling. This means we can have a road that accounting will use to get to work and you won't get backed up by sales because they now have their own road to get to work. VLANs take the cabling and equipment, which was just a road, and transform it into a landmass where network engineers can build fast highways, redundant streets, and with a little skill, a safe place to conduct your work.
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