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300-410 Practice Question: Which OSPF network type defaults to a 30-second…
Which OSPF network type defaults to a 30-second hello interval and requires a DR/BDR election?
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
✓
Non-broadcast (NBMA)
Non-broadcast (NBMA) network type uses a 30-second hello interval and elects a DR/BDR, as per RFC 2328.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Broadcast
Why it's wrong here
Broadcast uses 10-second hello interval and also elects DR/BDR.
- ✗
Point-to-point
Why it's wrong here
Point-to-point uses 10-second hello interval and does not elect DR/BDR.
- ✓
Non-broadcast (NBMA)
Why this is correct
NBMA uses 30-second hello interval and elects DR/BDR.
- ✗
Point-to-multipoint
Why it's wrong here
Point-to-multipoint uses 30-second hello interval but does not elect DR/BDR.
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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