easyMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to troubleshoot an…
A network engineer runs the following command to troubleshoot an Administrative Distance issue:
R1# show ip route 172.16.0.0 255.255.0.0
Routing entry for 172.16.0.0/16 Known via "ospf 1", distance 110, metric 20, type intra area Last update from 10.1.1.2 on GigabitEthernet0/0, 00:00:05 ago Routing Descriptor Blocks:
* 10.1.1.2, from 2.2.2.2, 00:00:05 ago, via GigabitEthernet0/0
Route metric is 20, traffic share count is 1
What does this output indicate?
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 an OSPF intra-area route with administrative distance 110, which is the default for OSPF.
The output shows an OSPF intra-area route with administrative distance 110, which is the default for OSPF. The metric is 20, and the route is learned from neighbor 2.2.2.2.
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 OSPF intra-area route with administrative distance 110, which is the default for OSPF.
Why this is correct
OSPF routes have a default AD of 110.
- ✗
The route is an OSPF external route with administrative distance 110.
Why it's wrong here
The output says 'type intra area', not external.
- ✗
The route has an administrative distance of 20 because it is an OSPF route.
Why it's wrong here
The AD is 110, not 20; the metric is 20.
- ✗
The route is preferred over an EIGRP route with AD 90.
Why it's wrong here
EIGRP internal AD 90 is lower than OSPF's 110, so OSPF would not be preferred.
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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