Juniper JN0-637 Exam - Topic 8 Question 15 Discussion

Actual exam question for Juniper's JN0-637 exam

Question #: 15
Topic #: 8

An ADVPN configuration has been verified on both the hub and spoke devices and it seems fine. However, OSPF is not functioning as expected.

Referring to the exhibit, which two statements under interface st0.0 on both the hub and spoke devices would solve this problem? (Choose two.)

Ainterface-type p2mp

Bdynamic-neighbors

Cpassive

Dinterface-type p2p

Show Suggested Answer

Suggested Answer: A, B

For ADVPN with OSPF, using a point-to-multipoint (p2mp) interface type and enabling dynamic-neighbors are crucial. This configuration allows dynamic discovery of neighbors and the establishment of tunnels. For more information, refer to Juniper ADVPN Configuration Guide.

In the ADVPN configuration, OSPF isn't functioning as expected due to the interface configuration on st0.0. Here are the adjustments needed:

Interface Type p2mp (Answer A): OSPF requires that the tunnel interface be set to p2mp (point-to-multipoint) to allow OSPF to communicate with multiple dynamic neighbors over the ADVPN tunnels.

Command Example:

bash

set interfaces st0.0 family inet ospf interface-type p2mp

Dynamic Neighbors (Answer B): The dynamic neighbors statement allows OSPF to discover and communicate with dynamically established spokes in an ADVPN environment. This is essential for ADVPN to function properly since the tunnel endpoints are not static.

Command Example:

bash

set protocols ospf area 0.0.0.0 interface st0.0 dynamic-neighbors

These settings ensure OSPF properly functions over dynamically created ADVPN tunnels.

by Allene at Jun 11, 2025, 12:07 AM

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Iesha

2 months ago

I’m surprised OSPF isn’t working with ADVPN; thought it was straightforward!

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Kayleigh

2 months ago

Option A is crucial for point-to-multipoint setups.

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Hester

3 months ago

I agree, but isn't option D better for OSPF?

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Tegan

3 months ago

Wait, why would we use passive mode? That seems off.

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Selma

3 months ago

I think option B is definitely needed for dynamic neighbors.

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Pamella

3 months ago

I think "passive" might not be the right choice since it prevents OSPF from sending hello packets. But I could be wrong!

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Joseph

4 months ago

I practiced a similar question where "interface-type p2mp" was mentioned. I wonder if that could be relevant here too.

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Maynard

4 months ago

I'm not entirely sure, but I feel like "dynamic-neighbors" could help with OSPF neighbor discovery. It seems familiar from practice questions.

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Bea

4 months ago

I remember that OSPF can have issues if the interface types aren't set correctly. I think "interface-type p2p" might be one of the answers.

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Alisha

4 months ago

Based on the information provided, I think the dynamic-neighbors and passive settings under the interface st0.0 could be the solution. I'll select those two options and see if that does the trick.

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Sommer

4 months ago

I'm a bit confused by this question. The exhibit shows the interface configuration, but I'm not sure which two statements would actually fix the OSPF issue. I'll need to think this through carefully.

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Zoila

5 months ago

Okay, let's see here. The interface-type setting seems like it could be the culprit. I'll try options A and D to see if that resolves the OSPF problem.

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Emmanuel

5 months ago

Hmm, this OSPF issue on the ADVPN seems tricky. I'll need to carefully review the interface configuration on both the hub and spoke devices.

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Bernadine

7 months ago

Haha, this question is like a riddle wrapped in an enigma! I'll take a wild guess and say A) interface-type p2mp and C) passive. Gotta love these JNCIA exams!

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Alex

7 months ago

User 2: Yeah, that could definitely help solve the issue.

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Cherry

7 months ago

User 1: I think you're on the right track with A) interface-type p2mp.

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Lamonica

8 months ago

I'm not sure about dynamic-neighbors and passive options. But changing the interface type sounds like a good solution to me.

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Alishia

8 months ago

I agree with Merri. Setting the interface type to point-to-multipoint and point-to-point should help with OSPF not functioning properly.

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Andrew

8 months ago

Wow, this is a tricky one! I'm going to go with B) dynamic-neighbors and D) interface-type p2p. ADVPN is all about dynamic peering, so that makes sense to me.

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Karrie

7 months ago

Yes, I agree. Setting dynamic neighbors and changing the interface type to point-to-point should resolve the issue with OSPF. Good choices!

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Mindy

7 months ago

I think you're on the right track with B) dynamic-neighbors and D) interface-type p2p. Those options would definitely help with OSPF not functioning properly.

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