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.
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?
3
Why wrong: 3 is not the default multiplier.
4
The default dead interval multiplier is 4, resulting in a dead interval of 40 seconds on broadcast networks.
5
Why wrong: 5 is not the default multiplier.
2
Why wrong: 2 is not the default multiplier.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
4
The dead interval is calculated as the hello interval multiplied by the dead interval multiplier, which defaults to 4.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
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
OSPF neighbours must agree on key parameters.
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
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
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.
What to study next
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
IPv6 Traffic Filtering and uRPF — study guide chapter
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FAQ
IPv6 Traffic Filtering and uRPF — This question tests IPv6 Traffic Filtering and uRPF — OSPF neighbours must agree on key parameters..
The correct answer is: 4 — The dead interval is calculated as the hello interval multiplied by the dead interval multiplier, which defaults to 4.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 18, 2026
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