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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
90 is the default AD for EIGRP.
- ✓
110
Why this is correct
OSPFv3 internal routes have a default AD of 110.
- ✗
115
Why it's wrong here
115 is not a standard AD.
- ✗
120
Why it's wrong here
120 is the default AD for RIP.
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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Last reviewed: Jul 4, 2026
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