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Juniper JN0-351 Exam - Topic 3 Question 14 Discussion

Actual exam question for Juniper's JN0-351 exam
Question #: 14
Topic #: 3
[All JN0-351 Questions]

Exhibit

You are troubleshooting an issue where traffic to 192.168.10.0/24 is being sent to R1 instead of your desired path through R2.

Referring to the exhibit, what is the reason for the problem?

Show Suggested Answer Hide Answer
Suggested Answer: C

The exhibit shows the output of the commandshow ip bgp, which displays information about the BGP routes in the routing table1. The output shows two routes for the destination 192.168.10.0/24, one from R1 and one from R2.

The route from R1 has a local preference of 200, while the route from R2 has a local preference of 100.Local preference is a BGP attribute that indicates the degree of preference for a route within an autonomous system (AS)2.A higher local preference means a more preferred route2.

BGP uses a best path selection algorithm to choose the best route for each destination among multiple paths.The algorithm compares different attributes of the routes in a specific order of precedence3.The first attribute that is compared is weight, which is a Cisco-specific attribute that is local to the router3.If the weight is equal or not set, the next attribute that is compared is local preference3.

In this case, both routes have the same weight of 0, which means that they are learned from external BGP (eBGP) peers3. Therefore, the next attribute that is compared is local preference.Since R1's route has a higher local preference than R2's route, it is chosen as the best path and installed in the routing table3. The other attributes, such as origin code and AS path, are not considered in this case.


by Chauncey at Mar 16, 2024, 12:08 PM

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Penney
3 months ago
Lower origin code could be the reason too, just saying!
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Sherrell
3 months ago
Wait, are we sure it's not a loop prevention thing? Seems odd.
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Tommy
3 months ago
Definitely a local preference issue, R2 is getting ignored.
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Ettie
4 months ago
I think it's about the AS path length, not local preference.
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Armanda
4 months ago
R1 has a higher local preference, that's why traffic is going there.
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Emogene
4 months ago
I’m leaning towards R1 having a higher local preference, but I need to double-check how that impacts the routing decision.
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Luis
4 months ago
I think R2 might not be the best path because of the origin code, but I can't recall the specifics.
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Elroy
4 months ago
This question feels similar to one we practiced where R1 had a better AS path. I think that could be relevant here too.
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Anabel
5 months ago
I remember something about local preference affecting route selection, but I'm not sure if that's the main issue here.
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Melinda
5 months ago
This is a classic BGP troubleshooting scenario. I'll methodically evaluate each option and use my knowledge of the BGP decision process to determine the root cause.
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Lucille
5 months ago
I've got a good handle on BGP best path selection, so I think I can work through this step-by-step and arrive at the right answer.
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Carlee
5 months ago
Okay, the key here is to identify the BGP attribute that is causing R1's route to be preferred over R2's. I'll focus on analyzing the local preference, AS path, and origin code.
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Tina
5 months ago
Hmm, I'm a bit confused by the different BGP attributes mentioned in the options. I'll need to refresh my memory on how they're used in the best path selection.
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Tina
5 months ago
This looks like a tricky BGP routing question. I'll need to carefully review the exhibit and think through the BGP path selection process.
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Lorenza
5 months ago
This is a tricky one, but I'm going to use the process of elimination to narrow down the options and make my best guess.
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Adela
5 months ago
Hmm, I'm a bit unsure about the difference between options A and C. Both seem to involve storing the test results and generating a report, but A mentions a dashboard while C just says email. I'll need to think this through carefully.
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Jerlene
5 months ago
I think I saw a practice question like this. Distributed networks usually refer to multiple nodes working together, but I don't recall if they always mean they're decentralized.
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Keith
2 years ago
I think D) R1's route is the best path due to the shorter AS path makes the most sense.
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Matilda
2 years ago
Could it be because R1's route has a higher local preference?
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Shanda
2 years ago
I believe the problem is related to the path attributes.
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Millie
2 years ago
Yeah, it seems like the traffic is going through R1 instead of R2.
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Quentin
2 years ago
I think the issue is with the route selection.
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