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Exam 300-410 topic 1 question 258 discussion

Actual exam question from Cisco's 300-410
Question #: 258
Topic #: 1
[All 300-410 Questions]


Refer to the exhibit. An engineer must configure PBR on R1 to reach to 10.2.2.0/24 via R3 AS64513 as the primary path and a backup route through default route via R2 AS64513. All BGP routes are in the routing table of R1, but a static default route overrides BGP routes. Which PBR configuration achieves the objective?

  • A. access-list 100 permit ip 10.1.1.0 0.0.0.255 10.2.2.0 0.0.0.255 ! route-map PBR permit 10 match ip address 100 set ip next-hop recursive 10.3.3.1
  • B. access-list 100 permit ip 10.1.1.0 255.255.255.0 10.2.2.0 255.255.255.0 ! route-map PBR permit 10 match ip address 100 set ip next-hop recursive 10.3.3.1
  • C. access-list 100 permit ip 10.1.1.0 0.0.0.255 10.2.2.0 0.0.0.255 ! route-map PBR permit 10 match ip address 100 set ip next-hop 10.3.3.1
  • D. access-list 100 permit ip 10.1.1.0 255.255.255.0 10.2.2.0 255.255.255.0 ! route-map PBR permit 10 match ip address 100 set ip next-hop 10.3.3.1
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Suggested Answer: A 🗳️
by chris7890 at Jan. 4, 2023, 1 p.m.

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shoo83
Highly Voted 2 years, 4 months ago
Answer is correct (A) The PBR Recursive Next Hop feature enhances route maps to enable configuration of a recursive next-hop IP address that is used by policy-based routing (PBR). The recursive next-hop IP address is installed in the routing table and can be a subnet that is not directly connected. If the recursive next-hop IP address is not available, packets are routed using a default route.
upvoted 10 times
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CiscoTerminator
Most Recent 2 months, 1 week ago
Selected Answer: C
R3 is next-hop. no need for recursion
upvoted 1 times
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tubirubs
8 months, 3 weeks ago
Selected Answer: C
A. set ip next-hop recursive 10.3.3.1: This would cause the router to look up 10.3.3.1 in the routing table to find a recursive next hop. However, this is unnecessary in this context because 10.3.3.1 is already the immediate next-hop IP address.
upvoted 2 times
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[Removed]
9 months, 2 weeks ago
Selected Answer: A
A is correct recursive keyword must be given since 10.3.3.1 is not directly connected.
upvoted 3 times
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[Removed]
1 year, 9 months ago
Am I blind or is answer A and C the same?
upvoted 2 times
[Removed]
1 year, 9 months ago
Disregard, I missed the keyword recursive under A
upvoted 1 times
Colmenarez
1 year, 8 months ago
Spot the difference type of question
upvoted 1 times
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inteldarvid
1 year, 9 months ago
A correct: https://notes.networklessons.com/pbr-next-hop-recursive
upvoted 1 times
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Aikat
2 years, 1 month ago
Selected Answer: A
Answer is C The PBR Recursive Next Hop feature enhances route maps to enable configuration of a recursive next-hop IP address that is used by policy-based routing (PBR). The recursive next-hop IP address is installed in the routing table and can be a subnet that is not directly connected. In this case 10.3.3.1 is a subnet which is not directly connected.
upvoted 2 times
Aikat
2 years, 1 month ago
I meant: Answer is A
upvoted 2 times
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chris7890
2 years, 4 months ago
Is this answer correct? As the Cisco document states: Note This configuration does not ensure that packets get routed using the recursive IP address if an intermediate IP address is a shorter route to the destination. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_pi/configuration/xe-3s/iri-xe-3s-book/iri-pbr-rec-next-hop-support.html
upvoted 2 times
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