Now, even though the King felt safer, he knew that traffic still had to flow in and out of his castle, or his subjects would surely have his head!
So he built drawbridges to allow him to decide what kinds of traffic he wanted to allow to flow in and out of the castle.
These drawbridges were called firewall rules. If the king wanted to allow his subjects to send letters to other castles but not waste their time on Skype, he could do that.

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Thanks great information but did I really need to click through 21 pages?
Thanks
Great service
So that’s how VPN works… Cool. Thanks, PayetteForward!