hardMultiple ChoiceObjective-mapped
300-410 Practice Question: An engineer configures PBR on a router to route…
An engineer configures PBR on a router to route traffic from subnet 10.1.1.0/24 to next-hop 192.168.1.2. The route-map is applied inbound on interface GigabitEthernet0/0. The engineer also configures 'ip policy route-map' on the same interface. However, the engineer notices that PBR is not working for multicast traffic from that subnet. What is the most likely explanation?
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
✓
PBR is not supported for multicast traffic; multicast uses its own forwarding mechanisms.
PBR does not process multicast traffic by default. Multicast packets are forwarded using multicast routing protocols (e.g., PIM) and are not subject to PBR. To apply PBR to multicast, special configuration (e.g., 'ip multicast policy route-map') is required.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
PBR is not supported for multicast traffic; multicast uses its own forwarding mechanisms.
Why this is correct
Multicast traffic is handled by multicast routing, not PBR, unless explicitly configured.
- ✗
The ACL in the route-map is blocking multicast addresses.
Why it's wrong here
Even if the ACL matches, PBR does not apply to multicast.
- ✗
The next-hop 192.168.1.2 is not a multicast-capable router.
Why it's wrong here
The issue is not about the next-hop but about PBR's inability to handle multicast.
- ✗
The route-map is missing a 'set ip next-hop verify-availability' command.
Why it's wrong here
This command is for tracking next-hop reachability, not for multicast support.
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
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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.