Juniper JN0-664 Exam - 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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Josephine

4 months ago

I disagree, RP2 should be the go-to for that group.

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Darci

4 months ago

Surprised that Anycast-RP can switch like that!

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Linwood

4 months ago

I think Source2 will actually use RP1, not RP2.

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Veronika

4 months ago

RP2 is definitely the one for Source2 and Receiver2.

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Rueben

4 months ago

Pretty sure Source1 and Receiver1 are both on RP1 for 224.1.1.1.

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Jerrod

5 months ago

I recall that the RP selection can be tricky with multiple sources and receivers. I need to double-check how the metrics play into this.

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Lynette

5 months ago

I think Source2 will definitely use RP2, but I'm a bit confused about the receiver side. Could it also be RP2?

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Eliz

5 months ago

This question feels similar to one we practiced where we had to determine RP selection based on OSPF metrics. I think RP2 might be favored here.

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Gail

5 months ago

I remember studying Anycast-RP, but I'm not sure how the metrics affect which RP is chosen in this scenario.

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France

6 months ago

This looks straightforward to me. I just need to apply my knowledge of PIM-SM and Anycast-RP to determine which RP is used in each case.

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Cassi

6 months ago

I'm a bit confused by the Anycast-RP setup. I'll need to review my notes on how that works to make sure I understand the implications for this question.

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Nilsa

6 months ago

Okay, I've got a strategy. I'll map out the paths from the sources to the RPs and from the RPs to the receivers, considering the interface metrics. That should help me identify the correct RP usage for each scenario.

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Jennie

6 months ago

Hmm, the exhibit shows Anycast-RP being used, so I'll need to understand how that affects the RP selection process. I'll have to think through the metrics and routing decisions.

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Quentin

6 months ago

This looks like a tricky multicast routing question. I'll need to carefully analyze the exhibit and the options to determine which RPs are used for each source and receiver.

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