mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Consider the following partial DMVPN…
Consider the following partial 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
tunnel source GigabitEthernet0/0 tunnel mode gre multipoint
ip nhrp map multicast dynamic
!
What is the effect of 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
✓
The hub will dynamically register spoke NHRP addresses and forward multicast traffic to all registered spokes.
The command 'ip nhrp map multicast dynamic' allows the hub to dynamically learn spoke NHRP addresses for multicast replication, which is essential for routing protocols (e.g., EIGRP, OSPF) that use multicast.
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 hub will dynamically register spoke NHRP addresses and forward multicast traffic to all registered spokes.
Why this is correct
This is correct; dynamic multicast mapping enables the hub to forward multicast to all spokes that have registered with NHRP.
- ✗
The hub will only forward multicast traffic to spokes that are statically mapped.
Why it's wrong here
Dynamic mapping allows automatic forwarding to all registered spokes without static maps.
- ✗
The hub will not forward multicast traffic at all because dynamic mapping is not supported.
Why it's wrong here
Dynamic mapping is supported and commonly used for DMVPN hubs.
- ✗
The hub will use broadcast instead of multicast for all traffic.
Why it's wrong here
The command specifically handles multicast, not broadcast.
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 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.