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300-410 Practice Question: In OSPFv3, which authentication method is…
In OSPFv3, which authentication method is supported by default?
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
✓
IPsec authentication
OSPFv3 uses IPsec for authentication and encryption, as defined in RFC 4552. It does not support the simple password or MD5 authentication used in OSPFv2.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
MD5 authentication
Why it's wrong here
Incorrect. MD5 authentication is used in OSPFv2, not OSPFv3.
- ✗
Simple password authentication
Why it's wrong here
Incorrect. Simple password authentication is used in OSPFv2, not OSPFv3.
- ✓
IPsec authentication
Why this is correct
Correct. OSPFv3 relies on IPsec for authentication and integrity.
- ✗
No authentication is supported
Why it's wrong here
Incorrect. OSPFv3 supports authentication via IPsec.
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.