mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Is troubleshooting a DMVPN phase 2 network where…
A network engineer is troubleshooting a DMVPN phase 2 network where the hub router is not learning the loopback interface routes from the spokes via EIGRP. The spokes have EIGRP configured on the tunnel interface and are advertising their loopback0 interface. The hub's EIGRP neighbor relationship with the spokes is established. However, the hub's routing table does not contain the loopback routes. The engineer checks the spoke's EIGRP configuration and sees that the loopback interface is not included in any network statement. What is the most likely cause?
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
✓
The spoke's EIGRP network statement does not include the loopback subnet.
EIGRP only advertises networks that are included in a network statement or configured under the EIGRP process. If the loopback interface is not included in a network statement, EIGRP will not advertise it.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The spoke's EIGRP network statement does not include the loopback subnet.
Why this is correct
Correct because EIGRP must have a network statement that matches the loopback subnet to advertise it.
- ✗
The hub's EIGRP is configured with a distribute-list that filters the loopback routes.
Why it's wrong here
Incorrect because the issue is on the spoke side; the hub is not receiving the routes.
- ✗
The tunnel interface on the spoke has 'no ip split-horizon' configured.
Why it's wrong here
Incorrect because split-horizon affects the hub's ability to advertise routes back to spokes, not the spoke's ability to advertise.
- ✗
The loopback interface on the spoke is in a different VRF than the tunnel interface.
Why it's wrong here
Incorrect because VRF mismatch would prevent EIGRP from learning the loopback, but the neighbor relationship is established.
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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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.