层次式交换网络支持三种类型服务：虚拟专线业务、确保服务和尽力而为。
The QoS model for HSNet includes three sorts of service: virtual leased line, assured forwarding and best effort.
顾名思义，虚拟专用网络我们可以把它理解成是虚拟出来的企业内部专线。
As the name implies, the virtual private network we can understand it as a virtual enterprise out of line.
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