- A
90
Why wrong: 90 is the default AD for EIGRP.
- B
110
OSPFv3 internal routes have a default AD of 110.
- C
115
Why wrong: 115 is not a standard AD.
- D
120
Why wrong: 120 is the default AD for RIP.
Question 1,115 of 2,152
What Is the Default Administrative Distance for OSPFv3 Internal Routes?
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 administrative distance for OSPFv3 internal routes?
Quick Answer
The answer is 110. This is the default administrative distance for OSPFv3 internal routes, identical to the value used in OSPFv2, because both protocols share the same fundamental route preference logic within the Cisco IOS routing table. Administrative distance is a trustworthiness metric that Cisco routers use to select the best route when multiple routing protocols provide a path to the same destination; a lower value is preferred. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding that OSPFv3, despite being the IPv6 counterpart, does not change its default distance—a common trap is assuming IPv6 protocols have different defaults. Remember that OSPF internal routes (both v2 and v3) sit at 110, while external OSPF routes are 110 by default as well. A simple memory tip: think of OSPF as the "one-ten" protocol—its internal trust level is always 110, regardless of the IP version.
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
✓
110
OSPFv3, like OSPFv2, uses a default administrative distance of 110 for all internal routes (intra-area and inter-area). This value is hard-coded in Cisco IOS and is not configurable per-route type; it distinguishes OSPF routes from other routing protocols. Option B is correct because 110 is the standard AD for OSPF (both versions) internal routes.
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that OSPFv3 might have a different administrative distance than OSPFv2, or that the AD changes for IPv6 protocols, but in reality, the default AD values are identical for both IPv4 and IPv6 versions of the same protocol.
Detailed technical explanation
How to think about this question
The administrative distance is a Cisco-specific trustworthiness metric used when multiple routing protocols provide routes to the same destination; OSPFv3 uses the same AD of 110 as OSPFv2, as defined in Cisco IOS documentation. Under the hood, OSPFv3 operates on a per-link basis rather than per-IP-subnet, using link-local addresses for neighbor discovery, but the AD remains unchanged. In a real-world scenario, if both OSPFv3 and EIGRP for IPv6 are redistributed, the router will prefer EIGRP routes (AD 90) over OSPFv3 routes (AD 110) unless the AD is manually modified.
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.
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.
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: 110 — OSPFv3, like OSPFv2, uses a default administrative distance of 110 for all internal routes (intra-area and inter-area). This value is hard-coded in Cisco IOS and is not configurable per-route type; it distinguishes OSPF routes from other routing protocols. Option B is correct because 110 is the standard AD for OSPF (both versions) internal routes.
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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