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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 10.10.10.0/24 should be forwarded to next-hop 192.168.100.2. The route map 'PBR-10' is configured with 'match ip address 130' and 'set ip next-hop 192.168.100.2'. The engineer applies the route map to interface GigabitEthernet0/0. The engineer notices that PBR is not working, and the router is dropping packets instead of forwarding them. The engineer checks the ACL 130 and confirms it matches 10.10.10.0/24. 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 route map has a deny statement that matches the traffic, causing packets to be dropped.
If PBR is dropping packets, it could be because the next-hop is unreachable and the route map has a 'set ip next-hop' command that fails, causing the router to drop the packet if no fallback is configured. However, by default, if the next-hop is unreachable, the router should use the routing table. But if the route map has a 'set ip next-hop' with 'verify-availability' and the next-hop is down, the router may drop the packet. Another possibility is that the route map has a 'deny' statement that drops traffic. The most likely cause is that the route map has a 'deny' statement that matches the traffic, causing it to be dropped.
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 route map has a deny statement that matches the traffic, causing packets to be dropped.
Why this is correct
Correct because a deny statement in the route map will cause the router to drop the packet if no other permit statement matches.
- ✗
The next-hop 192.168.100.2 is unreachable, and PBR drops packets when the next-hop is down.
Why it's wrong here
Incorrect because by default, if the next-hop is unreachable, PBR falls back to the routing table; it does not drop packets.
- ✗
The 'ip policy route-map' command is applied to the wrong interface, and the router is dropping packets due to ACL filtering.
Why it's wrong here
Incorrect because if applied to the wrong interface, PBR would not be evaluated; dropping would be due to other ACLs, not PBR.
- ✗
The ACL 130 is missing the 'permit' keyword, causing all traffic to be denied.
Why it's wrong here
Incorrect because if the ACL denies traffic, the route map would not match, and PBR would not apply; the router would use the routing table, not drop packets.
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JA
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.