Cisco Exam 300-420 Topic 5 Question 84 Discussion

Actual exam question for Cisco's 300-420 exam

Question #: 84
Topic #: 5

[All 300-420 Questions]

In a multicast network, which condition must be met for an RPF check to be performed on the RP address'?

AThe PIM DM device receives a multicast packet and has no directly connected members

BThe PIM router or multilayer switch has a shared-tree state

CThe PIM router or multilayer switch has a source-tree state

DThe PIM DM device receives a multicast packet and has no directly connected PIM neighbor

Show Suggested Answer

Suggested Answer: B

by Arlene at Mar 21, 2024, 02:48 AM

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Noel

4 days ago

I'm pretty sure the answer is B. The PIM router or multilayer switch needs to have a shared-tree state for the RPF check on the RP address to be performed. That makes sense to me.

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Stephaine

5 days ago

Ah, I see. The question is specifically asking about the condition for an RPF check on the RP address, not the source. That changes things a bit.

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Rima

6 days ago

Yes, that's a good point. The shared-tree state means the router is using the RP as the root of the multicast distribution tree, so the RPF check on the RP address would be necessary.

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Tammi

7 days ago

Yeah, that would be a pretty strange condition. I'm glad the actual answer seems to be B. It makes the most logical sense in the context of multicast routing.

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