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Nokia 4A0-103 Exam - Topic 2 Question 114 Discussion

Which of the following best describes downstream on demand label distribution?
C) An LSR distributes a label mapping for a FEC when it has been requested to do so.
A) An LSR answers requests for label mappings immediately, without waiting for a label mapping from the next-hop.
B) An LSR advertises label mappings to all peers for which it might be a next-hop for a given FEC
D) An LSR propagates a label mapping downstream for a FEC. only if it has a label mapping for the FEC's next-hop.

Nokia 4A0-103 Exam - Topic 2 Question 114 Discussion

Actual exam question for Nokia's 4A0-103 exam
Question #: 114
Topic #: 2
[All 4A0-103 Questions]

Which of the following best describes downstream on demand label distribution?

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Suggested Answer: C

by Lenora at Jul 11, 2025, 08:35 PM

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Linn
6 months ago
Wait, I thought it was D? This is confusing!
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Yolande
6 months ago
B is just wrong, it doesn't fit the definition.
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Slyvia
6 months ago
C makes the most sense to me, no doubt about it.
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Ceola
6 months ago
I think A is more accurate, but C is close.
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Giuseppe
6 months ago
Definitely C, that's how it works!
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Lashawnda
7 months ago
I’m confused between A and C. A sounds like it’s more immediate, but C seems to fit the definition of on demand better.
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Erin
7 months ago
I practiced a similar question, and I feel like option B is about advertising to all peers, but that doesn't seem to fit the "on demand" part.
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Herman
7 months ago
I'm not entirely sure, but I remember something about LSRs needing to wait for next-hop mappings. That might relate to option D?
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Allene
7 months ago
I think downstream on demand means that the LSR only sends the label mapping when it's specifically requested, which sounds like option C.
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Weldon
7 months ago
I'm a bit confused by the wording of these options. Can someone clarify the differences between them? I want to make sure I have a solid understanding before selecting an answer.
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Gerri
8 months ago
Okay, I've read through the question a few times now. I think option A best describes downstream on-demand label distribution, where the LSR responds immediately to requests without waiting for the next-hop.
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Emerson
8 months ago
Hmm, this one seems a bit tricky. I'll need to think through the different options carefully to make sure I understand the nuances between them.
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Van
8 months ago
I'm pretty sure this is asking about how label distribution works in MPLS networks. I think the key is understanding the difference between downstream on-demand and unsolicited label distribution.
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Ben
10 months ago
I'm leaning towards D, as it seems more logical to wait for the next-hop.
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Jennifer
10 months ago
Wait, are we talking about labels on packages or something? I'm totally lost here.
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Lynda
10 months ago
This question is making my brain hurt. Labeling and mapping, oh my!
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Serita
10 months ago
B) An LSR advertises label mappings to all peers for which it might be a next-hop for a given FEC
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Melvin
10 months ago
A) An LSR answers requests for label mappings immediately, without waiting for a label mapping from the next-hop.
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Avery
10 months ago
But A makes more sense because it's immediate.
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Adelle
10 months ago
Hmm, I'm torn between B and C. Doesn't an LSR advertise label mappings to all its peers in downstream on-demand distribution?
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Lavera
10 months ago
I'd go with D. The LSR needs to have a label mapping for the next-hop before it can propagate the label downstream, right?
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Marg
10 months ago
Yes, you're correct. The LSR only propagates the label downstream if it has a label mapping for the next-hop.
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Valentin
10 months ago
I disagree, I believe it's C.
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Rolande
11 months ago
Definitely C. That's exactly what on-demand label distribution is all about - the LSR waits for a request before distributing the label mapping.
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Lashawna
10 months ago
Yeah, it makes sense for the LSR to distribute the label mapping only when requested.
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Delsie
10 months ago
I think C is the correct answer too.
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Avery
11 months ago
I think the answer is A.
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