促使以太网跳出传统局域网范畴、进军广域网领域的原因有二:一是用户对具备更高速度、更灵活的广域网连接的需求在不断增长;二是来自电信运营商和服务提供商的推动,他们正急于把它们的整个电信基础架构从速度较慢的“老式”技术上升级到可管理性更强和成本效率更高的新一代网络技术上来。 There are two reasons for getting Ethernet out of the traditional LAN area and into the WAN area: First, the demand for higher speed and flexible WAN connectivity is growing. Second, they are driven by telecom operators and service providers who Are eager to upgrade their entire telecom infrastructure from slower “old-world” technologies to next-generation network technologies that are more manageable and cost-effective.