多选题Which three of these statements about penultimate hop popping are true？（）AIt is used only for directly connected subnets or aggregate routes.BIt can only be used with LDP.CIt is only used when two or more labels are stacked.DIt enables the Edge LSR to request a label pop operation from its upstream neighbors.EIt is requested through TDP using a special label value that is also called the implicit-null value.FIt is requested through LDP using a special label value that is also called the implicit-null value.
多选题
Which three of these statements about penultimate hop popping are true？（）
A
It is used only for directly connected subnets or aggregate routes.
B
It can only be used with LDP.
C
It is only used when two or more labels are stacked.
D
It enables the Edge LSR to request a label pop operation from its upstream neighbors.
E
It is requested through TDP using a special label value that is also called the implicit-null value.
F
It is requested through LDP using a special label value that is also called the implicit-null value.
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