WANs Wide Area Networks一个城市，或更大区域，国家，甚至全球SatelliteEarthStationSatelliteCentralMultiplexerofficeSatelliteRegionalHubberOfficeModemCoaxialcableWirelessHostComputerLanEnduserGatewayWANs Wide Area Networks 一个城市, 或更大区域, 国家, 甚至全球. Satellite Earth Station Satellite Central office Host Computer Multiplexer Hubber Coaxialcable Modem Satellite Regional Office Wireless Lan Gateway Enduser