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.
WAN连接类型包括专线、电路交换和分封交换。
WAN connection types include leased line, circuit-switched, and packet-switched.
WAN连接类型包括专线、电路交换和分封交换。
WAN connection types include leased line, circuit-switched, and packet-switched.
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