- A
3
Why wrong: 3 is not the default multiplier.
- B
4
The default dead interval multiplier is 4, resulting in a dead interval of 40 seconds on broadcast networks.
- C
5
Why wrong: 5 is not the default multiplier.
- D
2
Why wrong: 2 is not the default multiplier.
Question 1,106 of 2,152
OSPFv3 Dead Interval Default Value: 4
This 300-410 practice question tests your understanding of ipv6 traffic filtering and urpf. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
What is the default dead interval multiplier for OSPFv3?
Quick Answer
The answer is 4. This is the default dead interval multiplier for OSPFv3, meaning the router will wait for four times the configured hello interval before declaring a neighbor down. Technically, the OSPFv3 dead interval is not a directly configured value; instead, it is calculated by multiplying the hello interval by the dead interval multiplier, which defaults to 4 on Cisco IOS. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of OSPFv3 timer mechanics versus OSPFv2, where the dead interval is often explicitly set. A common trap is confusing the multiplier with the actual dead interval value—remember that if the hello interval is 10 seconds, the dead interval becomes 40 seconds, not 4 seconds. For a quick memory tip, think of the "four horsemen" of neighbor loss: the router waits four hellos before giving up.
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
✓
4
In OSPFv3, the default dead interval multiplier is 4, meaning the router dead interval is calculated as 4 times the hello interval. This is defined in RFC 5340 and is consistent with OSPFv2 behavior, ensuring that a neighbor is declared down after missing four consecutive hello packets.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
3
Why it's wrong here
3 is not the default multiplier.
- ✓
4
Why this is correct
The default dead interval multiplier is 4, resulting in a dead interval of 40 seconds on broadcast networks.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
5
Why it's wrong here
5 is not the default multiplier.
- ✗
2
Why it's wrong here
2 is not the default multiplier.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the default dead interval multiplier for OSPFv3 by making candidates confuse it with the OSPFv2 default multiplier (which is also 4) or with the EIGRP default multiplier of 3, leading to selection of option A.
Detailed technical explanation
How to think about this question
The dead interval multiplier is applied to the configured hello interval to derive the dead interval; for example, with a default hello interval of 10 seconds, the dead interval becomes 40 seconds. This multiplier of 4 is specified in RFC 5340 and is the same as OSPFv2, ensuring backward compatibility and predictable neighbor failure detection. In real-world scenarios, adjusting this multiplier can help tune convergence time versus stability on lossy links.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
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.
What to study next
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FAQ
Questions learners often ask
What does this 300-410 question test?
IPv6 Traffic Filtering and uRPF — This question tests IPv6 Traffic Filtering and uRPF — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 4 — In OSPFv3, the default dead interval multiplier is 4, meaning the router dead interval is calculated as 4 times the hello interval. This is defined in RFC 5340 and is consistent with OSPFv2 behavior, ensuring that a neighbor is declared down after missing four consecutive hello packets.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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