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Exam JN0-363 topic 1 question 43 discussion

Actual exam question from Juniper's JN0-363
Question #: 43
Topic #: 1
[All JN0-363 Questions]

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You are advertising a summary route that represents your local network (172.20.0.0/16) to both ISP A and ISP B. You want to influence all traffic sent to you from ISP C to go through R2.
How would you accomplish this task?

  • A. On R2, change the local preference value to 50.
  • B. On R1, change the local preference value to 250.
  • C. On R1, prepend your AS number three times on the 172.20.0.0/16 route when advertising it to ISP 1.
  • D. On R2, prepend your AS number three times on the 172.20.0.0/16 route when advertising it to ISP 2.
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Suggested Answer: C 🗳️
by theeprosemaestro at Jan. 20, 2024, 12:55 p.m.

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GolanZemach
9 months ago
Answer C
upvoted 3 times
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ZeeZaidi
9 months, 3 weeks ago
To influence ISP C to prefer the path through R2 for the 172.20.0.0/16 network, R2 should make its path less preferable to ISP B by prepending its AS number multiple times. This makes the path through R2 appear longer and less desirable to ISP C, which would receive these updates from ISP B. AS path length is a well-known attribute in BGP and is used to determine the best path; paths with a longer AS path are considered less preferable.
upvoted 1 times
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theeprosemaestro
10 months, 1 week ago
I am thinking it should be B. Changing the routing preference on R1 to 250 will prompt all traffic routing into the network to chose R2 as the preferred route.
upvoted 1 times
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