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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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Socorro
I remember studying that PIM primarily relies on the multicast routing table, so I think A might be correct.
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