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

What MPLS function should be performed by a router that receives a data packet with an MPLS label value of 0?
B) Pop the label.
D) Pop the label and push an additional label onto the label stack.
A) Push an additional label onto the label stack.
C) Swap the label.

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?

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Suggested Answer: B

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

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Eric
24 days ago
I think the router should pop the label.
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Providencia
29 days ago
I thought 0 meant something different in some cases?
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Nadine
1 month ago
It's just a label, but it means the packet is at the end of its MPLS path.
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Bernadine
1 month ago
Wait, are you sure it’s always 0? Sounds odd.
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Kasandra
1 month ago
Totally agree, that's standard MPLS behavior!
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Gabriele
2 months ago
The router should pop the label off the packet.
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Reena
2 months ago
Haha, I thought MPLS stood for "Mostly Pointless Label Switching"!
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Lai
2 months ago
The router should discard the packet, as a label value of 0 is invalid.
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Yasuko
2 months ago
Swap the MPLS label with a new value and forward the packet.
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Lenna
2 months ago
The router should pop the MPLS label and forward the packet based on the inner IP header.
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Annita
3 months ago
I’m a bit confused about the whole MPLS label stack. Does a label value of 0 mean it should just drop the packet or forward it normally?
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Lemuel
3 months ago
This kind of reminds me of a practice question where we had to identify what happens when a label is removed. I think it’s about forwarding the packet based on the IP header after popping the label.
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Fanny
3 months 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
4 months 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
4 months 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
4 months 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
4 months 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
4 months 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
4 months 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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