easyMultiple ChoiceObjective-mapped
300-410 Practice Question: In Policy-Based Routing (PBR), what is the…
In Policy-Based Routing (PBR), what is the default action for packets that do not match any route-map sequence?
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
✓
They are forwarded using the normal routing table.
Route-maps have an implicit deny at the end. For PBR, if a packet does not match any permit sequence, it is not policy-routed and is forwarded using the normal routing table.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
They are dropped.
Why it's wrong here
Only if the route-map ends with a deny statement that matches all traffic; otherwise, implicit deny means no PBR action, so normal routing applies.
- ✓
They are forwarded using the normal routing table.
Why this is correct
The implicit deny in a route-map for PBR means that unmatched packets are not subject to PBR and are routed normally.
- ✗
They are forwarded using the default route.
Why it's wrong here
Normal routing table lookup includes all routes, not just default.
- ✗
They are sent to the next-hop specified in the last sequence.
Why it's wrong here
Only matching sequences apply; unmatched packets are not affected.
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Variation 1. What is the default action for a packet that does not match any route-map entry in a PBR policy?
easy- A.The packet is dropped.
- ✓ B.The packet is forwarded using the routing table.
- C.The packet is sent to the CPU for processing.
- D.The router sends an ICMP unreachable message.
Why B: If no route-map entry matches, the packet is forwarded using the normal routing table lookup. PBR does not drop unmatched packets by default.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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