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Nokia 4A0-108 Exam - Topic 2 Question 131 Discussion

An Alcatel-Lucent 7750 SR is unable to locate a multicast source address in the multicast routing table. However, the source address is available in the unicast routing table. Which statement best describes the default RPF check behavior of the Alcatel-Lucent 7750 SR?
C) The RPF check succeeds, as PIM uses only the unicast routing table by default.
A) The RPF check fails, as PIM relies exclusively on the multicast routing table by default.
B) The RPF check fails, as it requires the source address be present in both the unicast and multicast routing tables.
D) The RPF check succeeds, as PIM uses the multicast routing table first, and then the unicast routing table by default.

Nokia 4A0-108 Exam - Topic 2 Question 131 Discussion

Actual exam question for Nokia's 4A0-108 exam
Question #: 131
Topic #: 2
[All 4A0-108 Questions]

An Alcatel-Lucent 7750 SR is unable to locate a multicast source address in the multicast routing table. However, the source address is available in the unicast routing table. Which statement best describes the default RPF check behavior of the Alcatel-Lucent 7750 SR?

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Suggested Answer: C

by Rikki at Aug 16, 2026, 12:20 PM

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Kristin
4 days ago
D) sounds right, but I need to double-check that.
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Cathern
9 days ago
Wait, so it can succeed with just the unicast table? That's surprising!
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Val
14 days ago
I thought C) was the case, but now I'm not so sure.
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Jeffrey
19 days ago
I disagree, B) makes more sense to me.
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Lavelle
24 days ago
A) is correct, PIM needs the multicast table.
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Simona
29 days ago
I recall that the RPF check does prioritize the multicast routing table, but I’m confused about how it interacts with the unicast table. D could be a possibility.
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Jacinta
1 month ago
I practiced a similar question, and I think PIM can use the unicast table if the multicast one is missing, so maybe C is the answer?
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Amber
1 month ago
I'm not entirely sure, but I feel like the RPF check needs both tables to succeed, which makes me lean towards B.
upvoted 0 times
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Socorro
1 month ago
I remember studying that PIM primarily relies on the multicast routing table, so I think A might be correct.
upvoted 0 times
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