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300-410 Practice Question: Consider the following DMVPN configuration on a…
Consider the following DMVPN configuration on a hub router:
interface Tunnel0 ip address 10.0.0.1 255.255.255.0 ip nhrp network-id 100 ip nhrp authentication cisco123 ip nhrp map multicast dynamic
tunnel source GigabitEthernet0/0 tunnel mode gre multipoint !
router eigrp 100 network 10.0.0.0 0.0.0.255
!
What is a potential issue with this configuration?
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
✓
EIGRP split-horizon is enabled by default on the tunnel interface, preventing spokes from learning routes from other spokes.
EIGRP over DMVPN requires split-horizon to be disabled on the hub's tunnel interface to allow spokes to learn routes from other spokes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
EIGRP split-horizon is enabled by default on the tunnel interface, preventing spokes from learning routes from other spokes.
Why this is correct
Split-horizon prevents the hub from advertising routes learned from one spoke to another spoke, which is a common issue in DMVPN.
- ✗
The NHRP authentication is missing on the spokes.
Why it's wrong here
The question is about the hub configuration; authentication mismatch would cause issues, but it is configured here.
- ✗
The tunnel mode should be 'gre ip' instead of 'gre multipoint'.
Why it's wrong here
GRE multipoint is correct for DMVPN hub.
- ✗
The EIGRP network statement is too broad.
Why it's wrong here
The network statement is correct for the tunnel subnet.
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 2
DMVPN Phase 2 is an advanced Cisco routing technology that allows spoke routers to communicate directly with one another without sending traffic through a central hub, using dynamic routing protocols and multipoint GRE tunnels.
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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.