mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: In DMVPN Phase 3 using OSPF, what is the default…
In DMVPN Phase 3 using OSPF, what is the default network type on a multipoint GRE tunnel interface?
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
✓
NBMA
By default, a multipoint GRE tunnel interface is treated as an OSPF NBMA network type. This requires manual neighbor configuration unless the interface is set to broadcast or point-to-multipoint.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
broadcast
Why it's wrong here
Incorrect. Broadcast is not the default; it must be explicitly configured.
- ✗
point-to-multipoint
Why it's wrong here
Incorrect. Point-to-multipoint is not the default for mGRE; it is an option for non-broadcast environments.
- ✓
NBMA
Why this is correct
Correct. The default OSPF network type for mGRE is NBMA.
- ✗
point-to-point
Why it's wrong here
Incorrect. Point-to-point is used on physical serial links or point-to-point GRE tunnels, not on mGRE.
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.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
DMVPN Phase 3
DMVPN Phase 3 is a Cisco networking technology that allows branch offices to connect directly to each other without always going through a central hub, but with smarter routing that lets the hub control the traffic paths more efficiently.
About these practice questions
Courseiva writes every 300-410 question from scratch — 1,966 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
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.