Exam JN0-363 topic 1 question 53 discussion

Actual exam question from Juniper's JN0-363

Question #: 53
Topic #: 1

Click the Exhibit button.

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?

A. Configure the ultimate-hop-popping statement under the R1_TO_R5 label switched path on R1.
B. Configure the explicit-null statement under the protocol mpls hierarchy on R1.
C. Configure the install statement under the R1_TO_R5 label switched path on R1.
D. Delete the no-cspf statement under the R1_TO_R5 label switched path on R1.

Show Suggested Answer

Suggested Answer: C 🗳️

by Sailor at May 28, 2023, 9:49 a.m.

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Epyon

3 months, 1 week ago

Selected Answer: C

C - install statement allows you to associate one or more prefixes with an LSP. It cannot be B (explicit-null) because explicit-null is specifically targeted to the egress router for label removal (as opposed to the penultimate router) and for QoS value checking by the core network.

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StefBrakki

3 months, 1 week ago

Selected Answer: B

B - The explicit-null label ensures that an MPLS header is retained in packets when they are forwarded through the label-switched path (LSP). It allows downstream devices to recognize the MPLS labels and forward traffic accordingly. This ensures that all devices within the LSP use the MPLS labels for traffic forwarding.

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desertprick

7 months ago

Selected Answer: C

he "install" command associates one or more IP prefixes with a Label Switched Path (LSP), effectively adding those prefixes to the routing table (inet.3 or inet6.3) once the LSP is active, allowing traffic destined for those prefixes to be routed through the MPLS tunnel established by the LSP; essentially, it "installs" the route for the specified prefixes within the MPLS context

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