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WAN generally means that there is a router involved, and thus IP routing is required to connect 2 end points. (OSI Layer 3 Network)

LAN generally means that devices are directly connected to a switched network, where there is no router, and where MAC addresses are used to connect 2 end points. (OSI Layer 2 Network)

However, originally, WAN referred to a physically wide area connection such as a T1 or Fibre Optic Ring, whereas LAN referred to computers connected within a short physical proximity.

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14y ago

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