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300-410 Practice Question: The default OSPF metric for a route learned over…
What is the default OSPF metric for a route learned over a DMVPN tunnel interface when the OSPF network type is broadcast?
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
✓
1
OSPF default metric for a route is based on the reference bandwidth (default 100 Mbps) divided by the interface bandwidth. For a tunnel interface, the default bandwidth is 100 Mbps (on many platforms), so the metric is 1. However, if the tunnel bandwidth is set differently, the metric changes. The default metric is 1 when bandwidth is 100 Mbps.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
1
Why this is correct
Correct. With default reference bandwidth 100 Mbps and tunnel bandwidth 100 Mbps, metric = 100/100 = 1.
- ✗
10
Why it's wrong here
Incorrect. 10 would result if tunnel bandwidth were 10 Mbps.
- ✗
100
Why it's wrong here
Incorrect. 100 would result if tunnel bandwidth were 1 Mbps.
- ✗
0
Why it's wrong here
Incorrect. OSPF metric cannot be 0; it is at least 1.
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
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.