mediumMultiple Choice
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show ip policy Interface Route-map
GigabitEthernet0/0 PBR-DEFAULT
R1# show route-map PBR-DEFAULT
route-map PBR-DEFAULT, permit, sequence 10 Match clauses:
ip address (access-lists): 150
Set clauses:
ip next-hop 10.0.0.2
Policy routing matches: 0 packets, 0 bytes
route-map PBR-DEFAULT, deny, sequence 20 Match clauses: Set clauses: Policy routing matches: 0 packets, 0 bytes
R1# show access-lists 150
Extended IP access list 150
10 permit ip 192.168.1.0 0.0.0.255 any R1# show ip route 10.0.0.2
Routing entry for 10.0.0.2/32 Known via "ospf 1", distance 110, metric 20 Last update from 10.1.1.2 on GigabitEthernet0/1
Based on this output, what is the most likely problem?
⚠ Common exam trap
The trap is assuming that the deny sequence or next-hop reachability is the issue, when the zero match count clearly indicates no matching traffic. Candidates must interpret the 'Policy routing matches' counter correctly.
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
✓
No traffic matching ACL 150 is arriving on GigabitEthernet0/0.
The most likely problem is that no traffic matching ACL 150 is arriving on GigabitEthernet0/0. The route map PBR-DEFAULT has a match clause for ACL 150, but the policy routing matches count is 0 packets, indicating that no packets have matched the ACL. Since the ACL permits traffic from 192.168.1.0/24, it suggests that no such traffic is being received on the interface.
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 deny sequence 20 is blocking all traffic from being policy-routed.
Why it's wrong here
Sequence 20 denies only traffic that reached it unmatched; access list 150 permits 192.168.1.0/24, so matching packets hit sequence 10 first and are policy-routed. The zero match counters indicate no packets traversed the interface, not denial by sequence 20.
- ✓
No traffic matching ACL 150 is arriving on GigabitEthernet0/0.
Why this is correct
The route-map and ACL are configured correctly, yet policy routing matches zero packets, meaning no traffic has hit the interface. The next-hop 10.0.0.2 is reachable via OSPF, so the fault lies in traffic not arriving, not in the policy itself.
- ✗
The next-hop 10.0.0.2 is unreachable.
Why it's wrong here
The routing table shows 10.0.0.2/32 learned via OSPF with a valid next hop on GigabitEthernet0/1, so it is reachable. Zero policy-routing matches point to no matching traffic arriving on GigabitEthernet0/0 rather than an unreachable next hop.
- ✗
The route map is missing a permit statement.
Why it's wrong here
Sequence 10 already permits matching traffic, and an implicit deny exists at the end of every route map, so a further permit statement is unnecessary. Zero matches indicate no matching packets entered GigabitEthernet0/0, not a missing permit entry.
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 and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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