- A
NHRP redirect
NHRP redirect is the mechanism that tells a spoke to resolve the NBMA address of another spoke directly.
- B
NHRP shortcut
Why wrong: NHRP shortcut is a switching feature that uses NHRP redirect information to install a direct route.
- C
NHRP registration
Why wrong: Registration is used by spokes to register with the hub.
- D
NHRP resolution
Why wrong: Resolution is the process of querying the NHS for a mapping.
Question 802 of 2,152
NHRP Redirect in DMVPN Phase 3
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?
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.
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
✓
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: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
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
Read the scenario before looking for a memorised answer.
- ✗
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
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Questions learners often ask
What does this 300-410 question test?
DMVPN — This question tests DMVPN — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
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.
What should I do if I get this 300-410 question wrong?
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 18, 2026
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