mediumMultiple ChoiceObjective-mapped
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?
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 route map has a deny sequence 20 with no match clause, which means it matches all packets. Since route maps are processed in order, if sequence 10 does not match (zero matches), sequence 20 will match all remaining packets and deny them (i.e., not apply PBR), causing them to be routed normally. However, the counters show zero for both sequences, indicating no traffic is being processed at all, likely because no traffic matching ACL 150 arrives 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 would only affect packets that reach it, but counters show zero matches, so no traffic reaches either sequence.
- ✓
No traffic matching ACL 150 is arriving on GigabitEthernet0/0.
Why this is correct
Zero matches on both sequences indicate no packets are being evaluated by the route map.
- ✗
The next-hop 10.0.0.2 is unreachable.
Why it's wrong here
It is reachable via OSPF.
- ✗
The route map is missing a permit statement.
Why it's wrong here
Sequence 10 is a permit; sequence 20 is deny, but the issue is no traffic.
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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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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