mediumMultiple Choice
300-410 Practice Question: Which two OSPF network types default to a hello…
Which two OSPF network types default to a hello interval of 30 seconds and a dead interval of 120 seconds on Cisco IOS? (Choose two.)
⚠ Common exam trap
Candidates often think only NBMA uses 30/120, but point-to-multipoint also uses these timers.
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)
On Cisco IOS, both the NBMA (Non-Broadcast Multi-Access) and point-to-multipoint OSPF network types default to a hello interval of 30 seconds and a dead interval of 120 seconds. Broadcast and point-to-point networks use 10 and 40 seconds, respectively. Therefore, both options C and D are correct.
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 OSPF network type defaults to hello interval 10 seconds and dead interval 40 seconds, not 30/120.
- ✗
Point-to-point
Why it's wrong here
Point-to-point OSPF network type defaults to hello interval 10 seconds and dead interval 40 seconds, not 30/120.
- ✓
Non-Broadcast (NBMA)
Why this is correct
Correct: NBMA OSPF network type defaults to hello interval 30 seconds and dead interval 120 seconds.
- ✓
Point-to-multipoint
Why this is correct
Correct: Point-to-multipoint OSPF network type also defaults to hello interval 30 seconds and dead interval 120 seconds.
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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