Quick Answer
The answer is NHRP redirect. This feature allows spokes to dynamically learn the NBMA address of another spoke without sending an explicit resolution request, because the hub sends a redirect message to the source spoke whenever it forwards a packet destined for another spoke across the tunnel. In DMVPN Phase 3, spokes use the NHRP redirect to discover a more optimal path, enabling them to build a direct spoke-to-spoke tunnel and bypass the hub for subsequent traffic. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of how Phase 3 differs from Phase 2—specifically, that Phase 3 relies on the hub to trigger path learning rather than requiring spokes to pre-cache mappings. A common trap is confusing NHRP redirect with NHRP shortcut; remember that redirect is the trigger, while shortcut is the resulting route. Memory tip: think of the hub as a traffic cop who waves a "redirect" sign to point one spoke directly to another.
This 300-410 practice question tests your understanding of dmvpn. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
In DMVPN Phase 3, which NHRP feature allows spokes to learn the NBMA address of other spokes without sending a resolution request?
NHRP redirect
NHRP redirect is the mechanism that tells a spoke to resolve the NBMA address of another spoke directly.
NHRP shortcut
Why wrong: NHRP shortcut is a switching feature that uses NHRP redirect information to install a direct route.
NHRP registration
Why wrong: Registration is used by spokes to register with the hub.
NHRP resolution
Why wrong: Resolution is the process of querying the NHS for a mapping.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
NHRP redirect
NHRP redirect is used in Phase 3 to inform spokes about better paths. The hub sends a redirect message to a spoke when it forwards a packet to another spoke, allowing the first spoke to learn the NBMA address of the second spoke.
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
For each option: why learners choose it and why it is or isn't the right answer here.
NHRP redirect
Why this is correct
NHRP redirect is the mechanism that tells a spoke to resolve the NBMA address of another spoke directly.
Related concept
Static NAT maps one inside address to one outside address.
NHRP shortcut
Why it's wrong here
NHRP shortcut is a switching feature that uses NHRP redirect information to install a direct route.
NHRP registration
Why it's wrong here
Registration is used by spokes to register with the hub.
NHRP resolution
Why it's wrong here
Resolution is the process of querying the NHS for a mapping.
Common exam traps
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.
Detailed technical explanation
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.
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
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.
What to study next
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 — study guide chapter
Learn the concepts, then practise the questions
DMVPN practice questions
Targeted practice on this topic area only
All 300-410 questions
2,152 questions across all exam domains
Cisco CCNP ENARSI 300-410 study guide
Full concept coverage aligned to exam objectives
300-410 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise 300-410 questions linked to Layer 3 Technologies.
Practise 300-410 questions linked to EIGRP Troubleshooting.
Practise 300-410 questions linked to OSPF Troubleshooting (v2/v3).
Practise 300-410 questions linked to BGP Troubleshooting.
Practise 300-410 questions linked to Route Redistribution.
Practise 300-410 questions linked to Policy-Based Routing (PBR).
Practise 300-410 questions linked to VRF-Lite.
Practise 300-410 questions linked to Route Maps and Route Filtering.
Practise 300-410 questions linked to Administrative Distance.
Practise 300-410 questions linked to Route Summarization.
Practise 300-410 questions linked to Bidirectional Forwarding Detection (BFD).
Practise 300-410 questions linked to VPN Technologies.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
DMVPN — This question tests DMVPN — Static NAT maps one inside address to one outside address..
The correct answer is: NHRP redirect — NHRP redirect is used in Phase 3 to inform spokes about better paths. The hub sends a redirect message to a spoke when it forwards a packet to another spoke, allowing the first spoke to learn the NBMA address of the second spoke.
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.
Static NAT maps one inside address to one outside address.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
Last reviewed: Jun 18, 2026
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.