单选题In a frame ，the MPLS label is imposed（）.AAfter the Layer3 header and before Layer2 headerBAfter the Layer2 header and before Layer3 headerCWithin the Layer 3 headerDBefore the layer 2 header
单选题
In a frame ，the MPLS label is imposed（）.
A
After the Layer3 header and before Layer2 header
B
After the Layer2 header and before Layer3 header
C
Within the Layer 3 header
D
Before the layer 2 header
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多选题Which three of the following steps are mandatory when configuring MPLS on Cisco IOS?（）(Choose three.)Astart LDPBenable CEF switchingCconfigure the MPLS IDDdisable IP TTL propagationEconfigure conditional label advertisingFenable label switching on frame mode interfaces