Nokia 4A0-103 Exam - Topic 3 Question 121 Discussion

Actual exam question for Nokia's 4A0-103 exam

Question #: 121
Topic #: 3

[All 4A0-103 Questions]

What MPLS function should be performed by a router that receives a data packet with an MPLS label value of 0?

DPop the label and push an additional label onto the label stack.

APush an additional label onto the label stack.

BPop the label.

CSwap the label.

Show Suggested Answer

Suggested Answer: B

by Erasmo at Jan 22, 2026, 10:11 PM

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Fanny

5 days ago

I remember something about how a router should pop the label when it sees a 0, but I'm not entirely sure if that's the only action it takes.

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Lai

10 days ago

I think a label value of 0 means the packet is not labeled anymore, right? So the router should just treat it like a regular IP packet?

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Brandon

15 days ago

Ah yes, I remember now - label 0 indicates the packet is leaving the MPLS domain. The router should remove the label and route the packet based on the IP header.

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Matthew

20 days ago

I'm a bit unsure about this one. The MPLS label values can be confusing, but I'll try to reason through it step-by-step.

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Nicolette

25 days ago

Label 0 means the packet is exiting the MPLS network, right? So the router should probably pop the label and forward the packet based on the IP header.

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Pete

1 month ago

Okay, I know MPLS label 0 is special, but I can't quite remember what it means. Gotta review my MPLS notes for this one.

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Corinne

1 month ago

Hmm, this one's tricky. I'll need to think carefully about the MPLS label values and what they signify.

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