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Exam 300-420 topic 1 question 205 discussion

Actual exam question from Cisco's 300-420
Question #: 205
Topic #: 1
[All 300-420 Questions]



Refer to the exhibit. A network engineer with an employee ID: 4433:77:420 must design a BGP solution based on these conditions:
• Traffic sessions occur between the branches and the data center.
• Branch B has limited resources to process routing updates.
• HQ must filter out all prefixes from branch A to R4.

Which outbound route filtering (ORF) solution must the engineer choose?

  • A. Use a prefix list with the 10.10.10.0/24 subnet for ORF on R5.
  • B. Use a prefix list with the 10.10.10.0/24 subnet for ORF on R2
  • C. Use a prefix list with the 192.168.10.0/24 subnet for ORF on R2.
  • D. Use a prefix list with the 192.168.10.0/24 subnet for ORF on R4.
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Suggested Answer: B 🗳️
by cerifyme85 at April 19, 2023, 5:32 a.m.

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neiker45
10 months ago
ORF will send messages to the other side asking for only the exact prefixes that are set up on the side that has set up ORF. Here's a good link for that: https://ine.com/blog/2008-05-05-understanding-bgp-outbound-route-filtering-bgp-orf
upvoted 1 times
TheGorn
10 months ago
So according to that document only the routes that are needed by Branch B should be in the ORF config of R2. Not the router that is supposed to be filtered out, and not the route that Branch B is. So that would eliminate all of the choices in the question from being correct. It would then be an ORF on R2 with 172.16.10.0/24 set as the advertised route...
upvoted 1 times
TheGorn
10 months ago
"not the route that is supposed to be filtered out"...
upvoted 1 times
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dgonzalezexamtopics
1 year, 6 months ago
Selected Answer: B
From R5 to R4 passing through R2 only 2 options. And the prefix list allowing source subnet to go outbound. For me, also B
upvoted 2 times
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cerifyme85
1 year, 6 months ago
Selected Answer: B
I think B is correct any taker?
upvoted 2 times
cerifyme85
1 year, 6 months ago
Filtering Branch A 10.x.x.x to Branch B with limited resources
upvoted 1 times
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