Internet提供的WAN通信与专线、帧中继或异步传输模式(ATM)网络相比,价格更廉、通信区域更全球化,但与专线网络相比,一般存在着安全性能、带宽保证或服务质量(QoS)方面的欠缺。此外,大多数网络使用多种协议,而Internet,虽花钱较少,但服务较差。 话虽如此,但情况已经有了变化,Internet服务供应 The Internet provides WAN communications that are cheaper and have a more global communications area than leased lines, Frame Relay or Asynchronous Transfer Mode (ATM) networks, but generally have security, bandwidth, or quality of service compared to leased-line networks (QoS) of the lack of. In addition, most networks use multiple protocols, and the Internet, though less expensive, offers less service. Having said that, but the situation has changed, Internet service providers