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300-410 Practice Question: Which THREE symptoms indicate that Policy-Based…
Which THREE symptoms indicate that Policy-Based Routing (PBR) is not working as expected? (Choose THREE.)
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
✓
Traffic that should be policy-routed follows the routing table instead.
If traffic that should be policy-routed follows the routing table instead, PBR may not be applied or the route-map may not match. High CPU usage can occur if PBR is process-switched and ACLs are large. If the 'set interface' specifies a down interface, packets are dropped. The 'show ip policy' command shows PBR application, not a symptom of failure. PBR does not affect routing table updates. A mismatch in ACLs can cause unintended forwarding.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Traffic that should be policy-routed follows the routing table instead.
Why this is correct
This indicates PBR is not matching the traffic or not applied correctly.
- ✓
High CPU usage on the router when processing PBR traffic.
Why this is correct
PBR can cause high CPU if process-switched, especially with large ACLs.
- ✗
The 'show ip policy' command shows the route-map applied to the interface.
Why it's wrong here
This is a verification command, not a symptom of failure; it confirms PBR is configured.
- ✓
Packets are dropped when the 'set interface' specifies a down interface.
Why this is correct
This is a known behavior: if the interface is down, the packet is dropped unless a fallback next-hop is set.
- ✗
The routing table is updated with new routes from PBR.
Why it's wrong here
Policy-Based Routing (PBR) does not install routes into the routing table; it uses route maps to override the forwarding decision for specific traffic based on attributes like source IP or packet length, leaving the routing table unchanged. This option is tempting because static or dynamic routing protocols do update the routing table, and one might confuse PBR’s traffic-selection mechanism with route injection.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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