单选题Using more than one label on a single packet is required in what context？（）AMPLS TEBMPLS VPNCWhen CEF switching and Label switching is doneDIn all the above circumstances
单选题
Using more than one label on a single packet is required in what context？（）
A
MPLS TE
B
MPLS VPN
C
When CEF switching and Label switching is done
D
In all the above circumstances
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