廣域網(Wide Area Network, WAN),又稱外網、公網。是連接不同地區的區域網或城域網的計算機通信的遠程網。通常跨接很大的物理範圍,所覆蓋的範圍從幾十公里到幾千公里,它能連接多個地區、城市和國家,或橫跨幾個洲並能提供遠距離通信,形成國際性的遠程網絡。
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