Juniper Exam JN0-664 Topic 2 Question 48 Discussion

Actual exam question for Juniper's JN0-664 exam

Question #: 48
Topic #: 2

Exhibit

Referring to the exhibit, PIM-SM is configured on all routers, and Anycast-RP with Anycast-PIM is used for the discovery mechanism on RP1 and RP2. The interface metric values are shown for the OSPF area.

In this scenario, which two statements are correct about which RP is used? (Choose two.)

ASource2 will use RP2 and Receiver2 will use RP2 for group 224.2.2.2.

BSource2 will use RP1 and Receiver2 will use RP1 for group 224.2.2.2.

CSource1 will use RP1 and Receiver1 will use RP1 for group 224.1.1.1.

DSource1 will use RP1 and Receiver1 will use RP2 for group 224.1 1 1

Show Suggested Answer

Suggested Answer: A, C

A sham link is a logical link between two PE routers that belong to the same OSPF area but are connected through an L3VPN. A sham link makes the PE routers appear as if they are directly connected, and prevents OSPF from preferring an intra-area back door link over the VPN backbone. A sham link creates an OSPF multihop neighborship between the PE routers using TCP port 646.The PEs exchange Type 1 OSPF LSAs instead of Type 3 OSPF LSAs for the L3VPN routes, which allows OSPF to use the correct metric for route selection1.

by Lynsey at Apr 30, 2025, 11:12 PM

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Brittni

1 months ago

Haha, this question is a real head-scratcher! I guess we'll have to use our PIM-SM skills to figure it out.

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Justine

26 days ago

I think Source1 and Receiver1 will use RP1 for group 224.1.1.1, based on the configuration.

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Bea

27 days ago

Let's analyze the exhibit carefully to determine the correct RP for each source and receiver.

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Stevie

2 months ago

I'm not sure about option C and D. Can someone explain why Source1 will use RP1 and Receiver1 will use RP2 for group 224.1.1.1?

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Ardella

2 months ago

I agree with Gary. Option A seems to be the right choice based on the exhibit.

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Lamonica

2 months ago

D looks good to me. The metric values show that Receiver1 is closer to RP2, so it should use that RP.

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Melissia

1 months ago

That makes sense, the metric values support that configuration.

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Rory

1 months ago

Source1 will use RP1 and Receiver1 will use RP2 for group 224.1.1.1.

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Cammy

1 months ago

But what about Source1 and Receiver1 for group 224.1.1.1?

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Jesusa

2 months ago

I agree, D seems to be the correct choice based on the metric values.

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Gary

2 months ago

I think option A is correct because Source2 and Receiver2 will use RP2 for group 224.2.2.2.

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Clement

3 months ago

I think B is the correct answer. The question states that Anycast-RP is used, which means the source and receiver will use the closest RP.

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Hollis

1 months ago

So, Source1 and Receiver1 will also use RP1 for group 224.1.1.1 according to the configuration.

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Nakita

1 months ago

Yes, that's right. Anycast-RP will ensure that the closest RP is used for multicast traffic.

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Freeman

2 months ago

I agree, B is the correct answer because Anycast-RP will make Source2 and Receiver2 use RP1.

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