![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
When an MPLS Layer 2 VPN runs in the hub-and-spoke model, where is QoS implemented()
A.hub and spoke
B.PE
C.E
D.hub
E.spoke
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
D、hub
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.hub and spoke
B.PE
C.E
D.hub
E.spoke
D、hub
B.To test SSF alarm function, AIS function needs to be enabled.
C.When on-demand LM function is enabled, you can set local LM or peer LM function and parameters like packet forwarding priority, sending interval, report interval and test time.
D.Forwarding priority of CV packet can be set randomly.
A.Label Switching Router
B.Label Swapping Router
C.Layer 3 Switching Router
D.Layer 2 Swapping Router
A.RSS configuration and fault management (CFM)
B.Layer 1 interface
C.Layer 2 interface
D.Layer 3 information
E.RSS A-bis interface
F.F.Handover detection and power control (HDPC)