Imagine you have an empty hallway (extension cable) with four rooms attached (ports), each room represents an electronic device, in these rooms are power monsters that only eat cupcakes, each monster requires a constant supply of cupcakes to feed it when the door is open, so children carry them in a steady stream to make sure each room gets it’s cupcakes, imagine only having one rooms door open that needs feeding, now open two, then three….Now the hallway is buzzing with children flowing to each room….Now, try to send more children with cupcakes than necessary…They get clogged in the hallway and the whole thing shuts down, close down two rooms and you still have the children going to the open rooms but the streams to those two rooms don’t need to change.
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