JN0-363 · Question #15
Referring to the exhibit. You have an established LSP between your R1 and R5 devices using the configuration shown in the exhibit. You are asked to ensure that MPLS labels are used to forward…
The correct answer is B. Configure the explicit-null statement under the protocol mpls hierarchy on R1. The "ultimate-hop-popping" term refers to the action taken by the penultimate router in an LSP to remove the MPLS label before delivering the packet to the ultimate router, which is not desired here. Configuring the "explicit-null" statement causes the penultimate router to…
Question
Referring to the exhibit. You have an established LSP between your R1 and R5 devices using the configuration shown in the exhibit. You are asked to ensure that MPLS labels are used to forward traffic by all devices within the LSP. Which action will accomplish this behavior?
Exhibit
Options
- AConfigure the ultimace-hop-popping statement under the R1_TO_R5 label switched path on R1.
- BConfigure the explicit-null statement under the protocol mpls hierarchy on R1.
- CDelete the no-espf statement under the R1_TO_R5 label switched path on R1.
- DConfigure the install statement under the R1_TO_R5 label switched path on R1.
How the community answered
(30 responses)- A10% (3)
- B83% (25)
- C3% (1)
- D3% (1)
Explanation
The "ultimate-hop-popping" term refers to the action taken by the penultimate router in an LSP to remove the MPLS label before delivering the packet to the ultimate router, which is not desired here. Configuring the "explicit-null" statement causes the penultimate router to replace the top label with a label that has a value of 0, which instructs the ultimate router to perform a label lookup and preserve the label switching for the entire LSP.
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