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Juniper Exam JN0-351 Topic 6 Question 13 Discussion

Actual exam question for Juniper's JN0-351 exam
Question #: 13
Topic #: 6
[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 Candida at Mar 09, 2024, 02:26 AM

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Melissa
7 months ago
Yes, checking for loops is crucial to prevent any routing loops in the network.
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Goldie
7 months ago
I believe the loops should also be checked to avoid any routing issues.
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Blythe
7 months ago
I agree, those are important conditions to ensure the validity of the received BGP route.
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Lamonica
7 months ago
I think the receiving router verifies the AS-path length and the next hop.
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