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Juniper Exam JN0-351 Topic 7 Question 23 Discussion

Actual exam question for Juniper's JN0-351 exam
Question #: 23
Topic #: 7
[All JN0-351 Questions]

After receiving a BGP route, which two conditions are verified by the receiving router to ensure that the received route is valid? (Choose two)

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Suggested Answer: B, C

Bis correct because the loops do not exist is one of the conditions that are verified by the receiving router to ensure that the received BGP route is valid.A loop in BGP means that a route has been advertised by the same AS more than once, which can cause routing instability and inefficiency1.To prevent loops, BGP uses the AS-path attribute, which lists the AS numbers that a route has traversed from the origin to the destination2.The receiving router checks the AS-path attribute of the received route and discards it if it finds its own AS number in the list2. This way, BGP avoids accepting routes that contain loops.

Cis correct because the next hop is reachable is one of the conditions that are verified by the receiving router to ensure that the received BGP route is valid.The next hop is the IP address of the next router that is used to forward packets to the destination network3.The receiving router checks the next hop attribute of the received route and verifies that it has a valid route to reach it3.If the next hop is not reachable, the received route is not usable and is rejected by the receiving router3. This way, BGP ensures that only feasible routes are accepted.


by Ira at Jul 06, 2024, 09:30 AM

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Nickolas
4 months ago
Wait, wait, wait... you're telling me I can't choose 'All of the above'? Where's the fun in that?
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Malcom
4 months ago
A and D? Nah, that's just crazy talk. The AS-path and local pref are important, but nothing beats checking for loops and reachability. B and C all the way!
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Alexis
3 months ago
C) The next hop is reachable.
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Madelyn
4 months ago
A) The AS-path length is greater than 0.
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Ernest
4 months ago
Yes, I think both conditions are important to ensure the received route is valid.
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Tegan
4 months ago
I believe the next hop should also be reachable.
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Lorrine
4 months ago
I agree with Brendan. That's one condition to verify.
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Lili
5 months ago
Haha, this one's a no-brainer! B and C, all the way! If the next hop is unreachable, what's the point of even considering the route, right?
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Michel
5 months ago
Hmm, I think B and C are the right answers. Gotta make sure there's no routing loops and the next hop is accessible, you know?
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Andra
3 months ago
Absolutely, B and C are crucial to verify when receiving a BGP route. It's important to avoid routing loops and ensure the next hop is accessible.
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Shannon
4 months ago
Yes, that's correct. Those are the two conditions that the receiving router verifies to ensure the received route is valid.
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Frederic
4 months ago
I agree, B and C are the correct answers. We need to ensure there are no loops and the next hop is reachable.
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Loreta
4 months ago
Good point, those are important conditions to verify for a valid BGP route.
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Marquetta
4 months ago
Definitely, we need to check for loops and ensure the next hop is reachable.
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Dalene
4 months ago
I agree, B and C are the correct answers.
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Brendan
5 months ago
I think the AS-path length should be greater than 0.
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Richelle
5 months ago
B and C, of course! I mean, who doesn't know that loops and reachability are the key things to check? Easy peasy!
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Glendora
4 months ago
Yep, those are definitely the two key conditions to verify for a valid BGP route.
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Valentin
4 months ago
I always make sure to check for loops and reachability when verifying BGP routes.
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