The answer is that the `ip nhrp redirect` command enables the hub to send redirect messages to spokes, instructing them to establish a direct tunnel to another spoke rather than routing traffic through the hub. This is correct because in DMVPN Phase 3, the hub dynamically learns of better paths between spokes via NHRP and uses redirect messages to inform a spoke that a more efficient direct path exists, triggering the spoke to initiate an NHRP resolution request to build a spoke-to-spoke tunnel. On the Cisco CCNP ENARSI 300-410 exam, this command tests your understanding of DMVPN Phase 3 optimization and is often paired with `ip nhrp shortcut` on the spoke side—a common trap is confusing it with `ip nhrp redirect` on the spoke, which is not used. A helpful memory tip is: the hub *redirects* the spoke to a shortcut, so think “hub redirects, spoke shortcuts.”
300-410 DMVPN Practice Question
This 300-410 practice question tests your understanding of dmvpn. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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 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.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Related concept
Static NAT maps one inside address to one outside address.
✗
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.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Trap categories for this question
Command / output trap
The command enables redirect, not disables NHRP.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
DMVPN — This question tests DMVPN — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 300-410 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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