What's the difference between a private network, as opposed to a virtual private network?

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A private network... is basically a network inside of one building... controlled entirely by one entity. Think of "private" in the same context as "private-property". A virtual private network means it may have several private networks that appear to be the same network that may be connected together through some sort of tunnel through a much larger network (the internet?). People attached to any place in the private network can talk directly to any other attached device in that private network... even if 1/2 of the network is located across the country only connected a tunnel to the other side.

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