Which of the following statements about penultimate hop popping are true?

Question

Valerio Lorenzani · Accepted Answer

It enables the Edge LSR to request a label pop operation from its upstream neighbors

Valerio Lorenzani · Accepted Answer

It is requested through LDP using a special label value that is also called the implicit-null value

Valerio Lorenzani · Accepted Answer

It is used only for directly connected subnets or aggregate routes

Valerio Lorenzani · Answer

It can only be used with LDP

Valerio Lorenzani · Answer

It is only used when two or more labels are stacked

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