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300-410 Practice Question: Is troubleshooting PBR on a Cisco router where…
A network engineer is troubleshooting PBR on a Cisco router where traffic from subnet 10.1.1.0/24 should be forwarded to next-hop 192.168.1.2. The route map 'PBR-10' is configured with 'match ip address 150' and 'set ip next-hop 192.168.1.2'. The engineer applies the route map to interface GigabitEthernet0/0. The engineer notices that PBR is not working, and the router is using the routing table to forward traffic. The engineer checks the ACL 150 and confirms it matches 10.1.1.0/24. The engineer also checks the interface configuration and sees 'ip policy route-map PBR-10' applied. What is the most likely cause?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The ACL 150 does not exist or is misconfigured, causing the route map to not match any traffic.
If PBR is not working and the router uses the routing table, it could be because the route map is not being processed due to a missing 'match' statement or the route map being empty. However, a common cause is that the route map has a 'match ip address' that references an ACL that does not exist or is misconfigured. The engineer should verify that the ACL 150 exists and is correctly configured.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The ACL 150 does not exist or is misconfigured, causing the route map to not match any traffic.
Why this is correct
Correct because if the ACL referenced in the route map does not exist, the route map will not match any traffic, and PBR will not be applied.
- ✗
The 'set ip next-hop' command is misspelled as 'set ip nexthop'.
Why it's wrong here
Incorrect because a misspelled command would cause a configuration error that the router would reject; the configuration would not be applied.
- ✗
The router is running an older IOS version that does not support PBR.
Why it's wrong here
Incorrect because PBR is supported in most IOS versions; the engineer would know if the router does not support it.
- ✗
The 'ip policy route-map' command is applied to the outgoing interface instead of the incoming interface.
Why it's wrong here
Incorrect because the scenario states the command is applied to interface GigabitEthernet0/0, which is the incoming interface.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.