mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Given the following partial DMVPN configuration…
Given 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 ip nhrp redirect
!
What is the purpose of the 'ip nhrp redirect' command?
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
✓
It enables the hub to send redirect messages to spokes, telling them to use a direct tunnel to another spoke.
In DMVPN Phase 3, the hub uses NHRP redirect to inform spokes about better paths to other spokes, enabling spoke-to-spoke direct tunnels.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
It enables the hub to send redirect messages to spokes, telling them to use a direct tunnel to another spoke.
Why this is correct
This is the correct function of NHRP redirect in Phase 3 DMVPN.
- ✗
It causes the hub to redirect all traffic through the hub itself.
Why it's wrong here
Redirect encourages direct spoke-to-spoke communication, not hub-centric.
- ✗
It enables the hub to dynamically map multicast addresses.
Why it's wrong here
Multicast mapping is done by 'ip nhrp map multicast dynamic'.
- ✗
It disables NHRP on the tunnel interface.
Why it's wrong here
The command enables redirect, not disables NHRP.
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.
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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