- A
10 seconds
Default hello interval for OSPFv3 on broadcast networks is 10 seconds.
- B
30 seconds
Why wrong: 30 seconds is the default for EIGRP.
- C
40 seconds
Why wrong: 40 seconds is the default dead interval for OSPF on broadcast networks.
- D
5 seconds
Why wrong: 5 seconds is not a default OSPF timer.
Question 977 of 2,152
What Is the Default OSPFv3 Hello Interval on Broadcast Networks?
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 hello interval for OSPFv3 on a broadcast network type in Cisco IOS-XE?
Quick Answer
The answer is 10 seconds. This is the default OSPFv3 hello interval on broadcast network types, identical to the OSPFv2 default because both protocols share the same fundamental neighbor discovery and maintenance logic on multi-access segments. On broadcast networks like Ethernet, routers must detect neighbor failures quickly, so a 10-second hello interval paired with a 40-second dead interval ensures rapid convergence without excessive overhead. For the Cisco CCNP ENARSI 300-410 exam, this fact tests your understanding that OSPFv3’s default timers are not changed by the shift to IPv6; a common trap is assuming OSPFv3 uses a different interval due to its new LSA types or link-local addressing. Remember, the hello interval is tied to the network type, not the protocol version. A simple memory tip: both OSPFv2 and OSPFv3 say “hello” every 10 seconds on broadcast—just like a standard 10-second countdown.
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
✓
10 seconds
OSPFv3 uses the same default hello interval as OSPFv2 for broadcast and point-to-point network types, which is 10 seconds. This is defined in RFC 5340 and is the default on Cisco IOS-XE for OSPFv3 on broadcast networks.
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.
- ✓
10 seconds
Why this is correct
Default hello interval for OSPFv3 on broadcast networks is 10 seconds.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
30 seconds
Why it's wrong here
30 seconds is the default for EIGRP.
- ✗
40 seconds
Why it's wrong here
40 seconds is the default dead interval for OSPF on broadcast networks.
- ✗
5 seconds
Why it's wrong here
5 seconds is not a default OSPF timer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the default hello interval for OSPFv3 by making candidates confuse it with OSPFv2 defaults or with the dead interval; the trap here is assuming OSPFv3 uses a different default than OSPFv2 for broadcast networks, when in fact both use 10 seconds.
Detailed technical explanation
How to think about this question
The hello interval is configured under the OSPFv3 process or interface using the 'ipv6 ospf hello-interval' command. On broadcast networks, the default dead interval is 40 seconds (4 × hello interval), and changing the hello interval automatically adjusts the dead interval unless explicitly set. In real-world scenarios, mismatched hello intervals prevent neighbor adjacency formation, which is a common troubleshooting point.
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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
IPv6 Traffic Filtering and uRPF — study guide chapter
Learn the concepts, then practise the questions
- →
IPv6 Traffic Filtering and uRPF practice questions
Targeted practice on this topic area only
- →
All 300-410 questions
2,152 questions across all exam domains
- →
Cisco CCNP ENARSI 300-410 study guide
Full concept coverage aligned to exam objectives
- →
300-410 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related 300-410 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Layer 3 Technologies practice questions
Practise 300-410 questions linked to Layer 3 Technologies.
EIGRP Troubleshooting practice questions
Practise 300-410 questions linked to EIGRP Troubleshooting.
OSPF Troubleshooting (v2/v3) practice questions
Practise 300-410 questions linked to OSPF Troubleshooting (v2/v3).
BGP Troubleshooting practice questions
Practise 300-410 questions linked to BGP Troubleshooting.
Route Redistribution practice questions
Practise 300-410 questions linked to Route Redistribution.
Policy-Based Routing (PBR) practice questions
Practise 300-410 questions linked to Policy-Based Routing (PBR).
VRF-Lite practice questions
Practise 300-410 questions linked to VRF-Lite.
Route Maps and Route Filtering practice questions
Practise 300-410 questions linked to Route Maps and Route Filtering.
Administrative Distance practice questions
Practise 300-410 questions linked to Administrative Distance.
Route Summarization practice questions
Practise 300-410 questions linked to Route Summarization.
Bidirectional Forwarding Detection (BFD) practice questions
Practise 300-410 questions linked to Bidirectional Forwarding Detection (BFD).
VPN Technologies practice questions
Practise 300-410 questions linked to VPN Technologies.
Practice this exam
Start a free 300-410 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
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: 10 seconds — OSPFv3 uses the same default hello interval as OSPFv2 for broadcast and point-to-point network types, which is 10 seconds. This is defined in RFC 5340 and is the default on Cisco IOS-XE for OSPFv3 on broadcast networks.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More 300-410 practice questions
- Drag and drop the steps to negotiate an IKEv2 IPsec site-to-site tunnel into the correct order, from first to last.
- Drag and drop the steps to troubleshoot an IPsec site-to-site VPN adjacency failure into the correct order, from first t…
- Drag and drop the steps to verify and validate the operational state of an IPsec site-to-site VPN into the correct order…
- Consider the following configuration snippet: ip cef ! interface GigabitEthernet0/0 ip address 10.0.0.1 255.255.255.25…
- A router is configured with 'logging host 10.1.1.100' and 'logging trap informational'. The engineer notices that syslog…
- Drag and drop the steps to configure a GRE tunnel for IPv6 over IPv4 into the correct order, from first to last.
Last reviewed: Jul 4, 2026
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.