easyMultiple Choice
300-410 Practice Question: The default administrative distance for OSPFv3…
What is the default administrative distance for OSPFv3 internal routes?
⚠ Common exam trap
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.
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.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
90
Why it's wrong here
Administrative distance 90 belongs to EIGRP internal routes, not OSPFv3. It is tempting because 90 is a commonly cited default distance, and it would be the correct answer if the question asked about EIGRP internal routes rather than OSPFv3.
- ✓
110
Why this is correct
OSPFv3 internal routes carry a default administrative distance of 110, matching OSPFv2's value for the same protocol family. Cisco assigns this distance so OSPFv3 routes are preferred over IS-IS (115) and RIP (120), but less trusted than EIGRP (90) and static routes (1).
- ✗
115
Why it's wrong here
Administrative distance 115 is assigned to IS-IS, not OSPFv3. It is tempting because 115 sits close to OSPF's 110 and is a familiar routing default, and it would be correct if the question asked about IS-IS internal routes.
- ✗
120
Why it's wrong here
Administrative distance 120 belongs to RIP, not OSPFv3. It is tempting because 120 is a well-known default distance value, and it would be the correct answer if the question asked about RIP's administrative distance rather than OSPFv3 internal routes.
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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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.