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单选题
When an MPLS Layer 2 VPN runs in the hub-and-spoke model， where is QoS implemented？（）
A
hub and spoke
B
PE
C
CE
D
hub
E
spoke
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考题
单选题How is a Martini Layer 2 MPLS VPN established?（）A
established using LDPB
established using BGPC
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established using IP
考题
多选题Which two of these are characteristics of MPLS VPNs?（）ALayer 3 MPLS VPNs can forward only IP packetsBLayer 2 MPLS VPNs can forward any network protocolCMPLS label paths are automatically formed based on Layer 2 framesDLayer 3 MPLS VPNs can forward any network protocol based on Layer 2 framesEIn Layer 2 MPLS VPNS, the service provider controls the customer Layer 3 policies
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单选题In a frame ，the MPLS label is imposed（）.A
After the Layer3 header and before Layer2 headerB
After the Layer2 header and before Layer3 headerC
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单选题Where is the MPLS label imposed？（）A
after the Layer 3 header and before the Layer 2 payloadB
after the Layer 3 header and before the Layer 4 payloadC
after the Layer 2 header and before the Layer 1 payloadD
after the Layer 1 header and before the Layer 2 payloadE
after the Layer 2 header and before the Layer 3 payload
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It adds the VPN label into the top label in the MPLS label stackB
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多选题When you design QoS on CE for an MPLS Layer 2 VPN， which three things should be considered？（）ALayer 2 access link QoS designBenterprise-to-service-provider mapping modelsCLayer 3 link access QoS designDservice provider service level agreementsELayer 2 link access load balancing
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