A WAN interconnects devices located at different geographical locations. A WAN typically
• Interconnects devices over a "long" distance (hence "wide-area")
• Belongs to someone else (the "service provider")
• Is there only when you want to send something
WAN protocols function at the lowest two layers of the OSI reference model, the physical layer and data link layer. (X.25 is an exception to this; it functions at layer three also.)
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