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Nokia 4A0-108 Exam - Topic 7 Question 96 Discussion

An Alcatel-Lucent 7750 SR is unable to locate a multicast source address in the multicast forwarding table. However, the source address is available in the unicast forwarding table.Which statement best describes the default RPF check behavior of the 7750 SR?
B) The RPF check will not fail, as by default PIM uses the multicast forwarding table first for RPF check, if not found in the multicast forwarding table then refers to unicast forwarding table
A) The RPF check will fail as PIM relies exclusively on the multicast forwarding table by default
C) The RPF check will not fail as PIM uses only the unicast forwarding table by default
D) The RPF check will fail as the RPF check requires that the source address be present in both the unicast and multicast forwarding table
E) Not enough information is provided to answer the question

Nokia 4A0-108 Exam - Topic 7 Question 96 Discussion

Actual exam question for Nokia's 4A0-108 exam
Question #: 96
Topic #: 7
[All 4A0-108 Questions]

An Alcatel-Lucent 7750 SR is unable to locate a multicast source address in the multicast forwarding table. However, the source address is available in the unicast forwarding table.

Which statement best describes the default RPF check behavior of the 7750 SR?

Show Suggested Answer Hide Answer
Suggested Answer: B

by Audry at Sep 12, 2024, 11:01 PM

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Portia
6 months ago
E seems plausible too, but I think we have enough info here.
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Yasuko
6 months ago
Definitely B, I've seen it work that way on multiple devices.
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Idella
7 months ago
Wait, I thought it only used the unicast table by default?
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Blossom
7 months ago
I disagree, A seems more accurate. It relies on the multicast table first.
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Aleisha
7 months ago
I'm pretty sure the answer is B. PIM checks both tables.
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Tess
7 months ago
I feel like I read that the RPF check can succeed even if the multicast table is empty, as long as the unicast table has the source. So, could it be option B?
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Elise
7 months ago
I’m a bit confused about the RPF check requirements. I thought it needed the source in both tables, but I might be mixing it up with something else.
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Shawnta
8 months ago
I remember practicing a similar question where it mentioned that PIM can refer to the unicast table if the multicast one doesn't have the entry. So maybe option B is correct?
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Susy
8 months ago
I think the RPF check relies on the multicast forwarding table first, so if it's not there, it might fail. But I’m not completely sure.
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Laura
8 months ago
Based on my understanding, the RPF check requires the source address to be present in both the unicast and multicast forwarding tables. So I think the answer is D - the RPF check will fail in this scenario.
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Amina
8 months ago
I'm a bit confused. The question mentions the source address is available in the unicast forwarding table, but does that mean PIM will use that for the RPF check? I'm not sure.
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Rosann
8 months ago
I'm pretty confident the answer is B. PIM uses the multicast forwarding table first for the RPF check, and if the source isn't found there, it refers to the unicast forwarding table.
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Carey
8 months ago
Okay, let's see. The question says the source address is in the unicast forwarding table but not the multicast forwarding table. I think that's the key detail here.
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Domingo
8 months ago
Hmm, this one seems tricky. I'll need to think carefully about the default RPF check behavior of the 7750 SR.
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Lyndia
8 months ago
Option A is definitely a no-go. Emailing unsubscribed customers is just going to annoy them and could get the company in trouble. I'm leaning towards C, D, and E - those seem like the safest bets to grow the email list the right way.
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Nan
1 year ago
The RPF check on the 7750 SR is like a game of hide-and-seek, but the source address is playing a sick prank and hiding in the wrong table!
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Elmer
11 months ago
D) The RPF check will fail as the RPF check requires that the source address be present in both the unicast and multicast forwarding table
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Janey
11 months ago
B) The RPF check will not fail, as by default PIM uses the multicast forwarding table first for RPF check, if not found in the multicast forwarding table then refers to unicast forwarding table
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Mattie
11 months ago
A) The RPF check will not fail, as by default PIM uses the multicast forwarding table first for RPF check, if not found in the multicast forwarding table then refers to unicast forwarding table
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Skye
1 year ago
Option B is the answer, no doubt. It's like trying to find a needle in a haystack, but the unicast table has your back!
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Ivette
1 year ago
User 3: Definitely! It's important to understand how the 7750 SR handles RPF checks for multicast sources.
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Kenneth
1 year ago
User 2: That makes sense. It's good to know that the unicast table can be used as a backup for the RPF check.
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Chauncey
1 year ago
User 1: Option B is correct. PIM first checks the multicast forwarding table, then the unicast forwarding table if needed.
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Kathrine
1 year ago
Hmm, this one's a head-scratcher. I'm going to go with option B, because I don't want to end up in the multicast forwarding table doghouse!
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Paris
1 year ago
User1: That's a good point, but I still think option B is the most likely scenario.
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Eleonore
1 year ago
User3: I'm not so sure, maybe we need more information to be certain.
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Rosendo
1 year ago
User2: Agreed, it's always best to check multicast before unicast.
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Arlyne
1 year ago
User1: I think option B is the way to go, it makes sense to check multicast first.
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Gladys
1 year ago
I think the question is a bit tricky. The key point is that the source address is available in the unicast forwarding table, even though it's not in the multicast forwarding table. Option B is the way to go.
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Mozell
1 year ago
User 2: I agree, it makes sense to check multicast forwarding table first.
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Annelle
1 year ago
User 1: I think the answer is B, PIM checks multicast forwarding table first.
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Rolf
1 year ago
That makes sense too, maybe we need more information to be sure.
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Gail
1 year ago
The correct answer is B. PIM uses the multicast forwarding table first for RPF check, and if the source address is not found, it refers to the unicast forwarding table. This is the default behavior of the 7750 SR.
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Talia
1 year ago
I disagree, I believe the answer is D because the RPF check requires the source address to be in both tables.
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Rolf
1 year ago
I think the answer is B because PIM first checks the multicast forwarding table for RPF.
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