Juniper JN0-664 Exam - Topic 4 Question 38 Discussion

Actual exam question for Juniper's JN0-664 exam

Question #: 38
Topic #: 4

Refer to the exhibit.

Click the Exhibit button.

Referring to the exhibit, the PE-to-CE protocol being used is OSPF for the L3VPN. Also, there is an OSPF neighborship between CE-1 and CE-2.

Which statement is correct in this situation?

AYou must set a high metric on the CE-1 to CE-2 link for hosts at Site-1 to use the L3VPN to reach hosts at Site-2.

BHosts at Site-1 will reach hosts at Site-2 through the CE-1 and CE-2 link by default.

CHosts at Site-1 will reach hosts at Site-2 through the L3VPN by default.

DYou must set a high metric on the CE-1 to PE-1 link for hosts at Site-1 to use the CE-1 to CE-2 link to reach hosts at Site-2.

Show Suggested Answer

Suggested Answer: B

In the exhibit, the PE-to-CE protocol used is OSPF, and there is an OSPF neighborship between CE-1 and CE-2 within the same Area 0. Let's analyze the default OSPF routing behavior in this setup to determine the correct statement.

1. **OSPF Neighborship**:

- CE-1 and CE-2 have an OSPF neighborship directly within Area 0.

- OSPF prefers intra-area routes over inter-area and external routes.

2. **Default Routing Behavior**:

- Since CE-1 and CE-2 are directly connected through an OSPF link within the same area, OSPF will prefer this direct intra-area path over any other paths learned via the PE routers and the L3VPN.

- This is because intra-area routes have a lower metric compared to inter-area or external routes.

3. **Metric Considerations**:

- By default, OSPF will route traffic between Site-1 and Site-2 through the direct link between CE-1 and CE-2, unless the link's metric is artificially increased to make it less preferable.

- There is no need to adjust metrics for the CE-1 to PE-1 link to prefer the CE-1 to CE-2 path, as OSPF already prefers direct intra-area paths.

**Conclusion**:

Given the default behavior of OSPF and the topology shown in the exhibit, the correct statement is:

**B. Hosts at Site-1 will reach hosts at Site-2 through the CE-1 and CE-2 link by default.**

**Reference**:

- OSPF Design Guide: [Juniper Networks OSPF Design Guide](https://www.juniper.net/documentation/en_US/junos/topics/concept/ospf-design-overview.html)

- Juniper Networks Technical Documentation on OSPF: [Junos OS OSPF Configuration Guide](https://www.juniper.net/documentation/en_US/junos/topics/concept/ospf-routing-overview.html)

by Melissa at Sep 17, 2024, 12:49 PM

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Devora

3 months ago

High metrics can really mess with traffic flow, good point!

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Nickolas

3 months ago

Wait, are we sure about the default routing? Sounds off.

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Whitley

3 months ago

Not so sure about that, I lean towards C.

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Sylvie

4 months ago

I think B is the right choice!

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Anissa

4 months ago

OSPF is definitely the protocol here.

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Vilma

4 months ago

I’m leaning towards A because setting a high metric seems like a common requirement in these scenarios, but I need to double-check my notes.

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Lino

4 months ago

I feel like C could be right since it mentions the L3VPN, but I can't recall the specifics about the CE links.

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Alyce

4 months ago

I remember practicing a similar question where we had to consider metrics, so maybe A or D could be correct too.

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Devorah

5 months ago

I think the answer might be B, but I'm not entirely sure if the default behavior applies here.

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Melodie

5 months ago

Hmm, I'm not sure about that. The question is asking which statement is correct, so I'll need to carefully evaluate each option to determine the best answer.

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Nelida

5 months ago

I think the answer is C. Hosts at Site-1 will reach hosts at Site-2 through the L3VPN by default, since OSPF is being used for the VPN. The CE-1 to CE-2 link is just a backup path.

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Corazon

5 months ago

Okay, let me think this through. The key information is that OSPF is being used for the L3VPN, and there's an OSPF neighbor relationship between CE-1 and CE-2. I'll need to consider how traffic would flow between the sites based on that.

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Jerry

5 months ago

This question seems straightforward, but I want to make sure I understand the details correctly before answering.

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Isabella

5 months ago

This looks like a straightforward question about user access management in Activiti. I think the key is to identify the specific action needed to grant a user the "App Designer" capability.

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Nadine

1 year ago

C is the clear winner here. Why complicate things when the L3VPN is the natural choice for reaching hosts at Site-2?

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King

1 year ago

No need to overcomplicate things, C is the way to go.

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Dorthy

1 year ago

Definitely, using the L3VPN for reaching hosts at Site-2 makes the most sense.

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Janessa

1 year ago

I agree, C is the most straightforward option.

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Edelmira

1 year ago

Haha, setting a high metric on the CE-1 to CE-2 link to make hosts use the L3VPN? That's like trying to swim upstream, just let the L3VPN do its job, man.

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Tammara

1 year ago

Option B seems tempting, but with the OSPF neighborship, the traffic will flow through the L3VPN by default. C is the way to go.

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James

1 year ago

Setting a high metric on the CE-1 to CE-2 link is not necessary for traffic between Site-1 and Site-2.

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Abel

1 year ago

Yeah, with the OSPF neighborship, traffic will definitely flow through the L3VPN.

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Markus

1 year ago

I agree, option C is the correct choice in this situation.

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Kanisha

1 year ago

Why do you think that?

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Loren

1 year ago

I disagree, I believe the correct answer is A.

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Rachael

1 year ago

I think the correct answer is C. The L3VPN will be the default path for hosts at Site-1 to reach hosts at Site-2 since there is an OSPF neighborship between CE-1 and CE-2.

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Josue

1 year ago

Agreed. The OSPF neighborship between CE-1 and CE-2 ensures the traffic will flow through the L3VPN.

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Myra

1 year ago

That makes sense. Setting a high metric on the CE-1 to CE-2 link would not be necessary in this scenario.

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Dusti

1 year ago

Yes, you are right. Hosts at Site-1 will reach hosts at Site-2 through the L3VPN by default.

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Floyd

1 year ago

I think the correct answer is C. The L3VPN will be the default path for hosts at Site-1 to reach hosts at Site-2 since there is an OSPF neighborship between CE-1 and CE-2.

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Kanisha

1 year ago

I think the correct statement is C.

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