Fix typo spotted by Andrew Scheller.
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@ -119,7 +119,7 @@ computers on the other end of the Internet.
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This problem can be solved by using @emph{virtual} networks. Virtual
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networks can live on top of other networks, but they use encapsulation to
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keep using their private address space so they do not interfere with
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the Internet. Mostly, virtual networks appear like a singe LAN, even though
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the Internet. Mostly, virtual networks appear like a single LAN, even though
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they can span the entire world. But virtual networks can't be secured
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by using firewalls, because the traffic that flows through it has to go
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through the Internet, where other people can look at it.
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