Question 111 of 2,152

DMVPN →mediumMultiple ChoiceObjective-mapped

ip nhrp redirect

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?

A
It enables the hub to send redirect messages to spokes, telling them to use a direct tunnel to another spoke.
This is the correct function of NHRP redirect in Phase 3 DMVPN.
B
It causes the hub to redirect all traffic through the hub itself.
Why wrong: Redirect encourages direct spoke-to-spoke communication, not hub-centric.
C
It enables the hub to dynamically map multicast addresses.
Why wrong: Multicast mapping is done by 'ip nhrp map multicast dynamic'.
D
It disables NHRP on the tunnel interface.
Why wrong: The command enables redirect, not disables NHRP.

Full breakdown with real-world context →

Quick Answer

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.”

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.

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.

✓
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
Read the scenario before looking for a memorised answer.
✗
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: 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.

Trap categories for this question

Command / output trap
The command enables redirect, not disables NHRP.

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: 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?

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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