Which three of these statements about penultimate hop popping are true? (Choose three.)

The correct answer is 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. In order to implement penultimate hop popping, the edge LSR requests a label pop operation from its upstream neighbor via LDP or TDP using a special implicit-null label. This label has a value of 3 for LDP and 1 for TDP.

MPLS

Question

Options

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.

How the community answered

(29 responses)

A
3% (1)
B
10% (3)
C
3% (1)
D
83% (24)

Explanation

In order to implement penultimate hop popping, the edge LSR requests a label pop operation from its upstream neighbor via LDP or TDP using a special implicit-null label. This label has a value of 3 for LDP and 1 for TDP.

Topics

#penultimate hop popping#LDP#TDP#implicit-null

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