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Exam 300-510 topic 1 question 5 discussion

Actual exam question from Cisco's 300-510
Question #: 5
Topic #: 1
[All 300-510 Questions]


Refer to the exhibit. A network operator is getting the route for 10.11.11 0/24 from two upstream providers on #XR3. The network operator must configure #XR3 to force the 10.11.11.0/24 prefix to route via next hop of 10.0.0.9 as primary when available. Which of these can the operator use the routing policy language for, to enforce this traffic forwarding path?

  • A. weight of 0 on the prefix coming from 192.168.0.2
  • B. lower local preference on the prefix coming from 192.168.0.2
  • C. higher local preference on the prefix coming from 192.168.0.1
  • D. weight of 100 on the prefix coming from 192.168.0.1
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️

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MRasul18
Highly Voted 4 years, 4 months ago
Correct answer isA. weight of 0 on the prefix coming from 192.168.0.2 Because Weight is the first attribute in path selection algorithm and is 0 for eBGP routes by default. If we set it to 0, router will continue from weight to the bottom, and when comparing neighbor router IDs it will find 192.168.0.1 less than 192.168.0.2 and st path will be selected as the best
upvoted 13 times
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[Removed]
Most Recent 8 months, 2 weeks ago
Selected Answer: A
A is correct answer.
upvoted 1 times
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Jesber
2 years, 3 months ago
Selected Answer: A
" weight of 0 on the prefix coming from 192.168.0.2 " is the correct answer
upvoted 1 times
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cipikacipiki
2 years, 5 months ago
Selected Answer: A
test on the lab. correct answer is A, like many others comment. Because if we set weight 0 on prefix coming from 192.168.0.2 best path comparison will meet at the router-id stage since other attribute are identical.
upvoted 1 times
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craterman
3 years, 4 months ago
Selected Answer: A
Correct answer is A. Neighbor 192.168.0.2 has already weight 651. So no other one attribute will not influence to best path selection.
upvoted 3 times
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foxroot
4 years ago
Yes. Correct answer A. less than 192.168.0.2 and st path will be selected as the best
upvoted 1 times
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jmbecerra
4 years, 4 months ago
Correct answer is D. As we are already using the weight attribute for selecting the prefix received from 192.168.0.2 (weight 61) as the best, it would be better if we use the same attribute to select the prefix received from 192.168.0.1 (so we need to configure weight 100)... if we configure weight 0 on the prefix received from 192.168.0.2, we will let the BGP algorithm to select the best route based on the other attibutes and this doesn't assure the election of the prefix received from 192.168.0.1 as the best.
upvoted 1 times
pavned
4 years, 4 months ago
192.168.0.2 (weight 651)
upvoted 2 times
jmbecerra
4 years, 3 months ago
yeah, you’re right... my bad if we change the weight on 192.168.0.2 originated route to 0, the other route will be elected as best route for coming from an origin with lowest router id
upvoted 2 times
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pavned
4 years, 4 months ago
i think correct A. A. weight of 0 on the prefix coming from 192.168.0.2
upvoted 1 times
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