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Exam 300-410 topic 1 question 258 discussion

Actual exam question from Cisco's 300-410

Question #: 258
Topic #: 1

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

Show Suggested Answer

Suggested Answer: A 🗳️

by chris7890 at Jan. 4, 2023, 1 p.m.

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shoo83

Highly Voted 2 years, 5 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.

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CiscoTerminator

Most Recent 4 months ago

Selected Answer: C

R3 is next-hop. no need for recursion

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tubirubs

10 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.

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[Removed]

11 months, 1 week ago

Selected Answer: A

A is correct recursive keyword must be given since 10.3.3.1 is not directly connected.

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[Removed]

1 year, 11 months ago

Am I blind or is answer A and C the same?

upvoted 2 times

[Removed]

1 year, 11 months ago

Disregard, I missed the keyword recursive under A

upvoted 1 times

Colmenarez

1 year, 9 months ago

Spot the difference type of question

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inteldarvid

1 year, 11 months ago

A correct: https://notes.networklessons.com/pbr-next-hop-recursive

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Aikat

2 years, 3 months 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.

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Aikat

2 years, 3 months ago

I meant: Answer is A

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chris7890

2 years, 5 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

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