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 route 192.168.1.0
Routing entry for 192.168.1.0/24 Known via "ospf 1", distance 110, metric 20, type extern 2, forward metric 100 Redistributing via ospf 1 Last update from 10.1.1.2 on GigabitEthernet0/1, 00:00:05 ago Routing Descriptor Blocks:
* 10.1.1.2, from 10.1.1.2, 00:00:05 ago, via GigabitEthernet0/1
Route metric is 20, traffic share count is 1
Based on this output, what is the 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
✓
The route is being redistributed back into OSPF, which could cause a routing loop if not filtered.
The output shows a route learned via OSPF with type extern 2 and metric 20. The route is also 'Redistributing via ospf 1', meaning this router is redistributing this route back into OSPF. This could cause a routing loop if the route is redistributed back into the same OSPF process from which it was learned. The problem is that the route is being redistributed without filtering, potentially causing loops.
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 route is an external OSPF route with metric 20, which is the default for Type 2 external routes.
Why it's wrong here
This is correct, but not a problem.
- ✓
The route is being redistributed back into OSPF, which could cause a routing loop if not filtered.
Why this is correct
Redistributing a route learned from OSPF back into OSPF without filtering can cause loops.
- ✗
The forward metric is 100, which is the metric to the ASBR.
Why it's wrong here
The forward metric is normal for external routes.
- ✗
The route is learned from neighbor 10.1.1.2, which is the next hop.
Why it's wrong here
This is normal.
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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