- A
Configure the tunnel interface as a multipoint GRE interface.
DMVPN Phase 3 requires the tunnel to be multipoint GRE (mGRE) to support multiple spoke connections.
- B
Set the tunnel source to the physical interface (e.g., GigabitEthernet0/1).
The tunnel source must be the physical interface that provides the NBMA address.
- C
Configure an NHRP map to the hub with an authentication string.
The spoke must have an NHRP map pointing to the hub's NBMA and tunnel addresses, along with authentication for security.
- D
Disable split horizon on the tunnel interface.
Why wrong: While split horizon may need to be disabled for routing protocols in some DMVPN designs, it is not a required step for Phase 3 on the spoke.
- E
Configure the tunnel mode as 'tunnel mode ipsec ipv4'.
Why wrong: This command enables IPsec protection, which is optional and not a required step for basic Phase 3 operation.
Quick Answer
The answer is that you must configure the tunnel interface as multipoint GRE (mGRE), set the tunnel source to the physical interface, and configure an NHRP map to the hub with an authentication string. These three steps are required because DMVPN Phase 3 spokes rely on mGRE to dynamically establish tunnels with multiple peers, while the tunnel source defines the exit interface for all traffic, and the NHRP map with authentication ensures secure registration with the hub. On the Cisco CCNP ENARSI 300-410 exam, this question tests your ability to distinguish Phase 3 spoke essentials from optional features like `ip nhrp shortcut` and `ip nhrp redirect`, which are often included in Phase 3 but not mandatory for basic spoke operation. A common trap is confusing the hub’s redirect command with a spoke requirement—remember, the spoke only needs the map, mGRE, and source. Memory tip: “Spokes need three S’s—Source, mGRE, and Security (authentication).”
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.
Which THREE configuration steps are required to enable DMVPN Phase 3 on a spoke router? (Choose THREE.)
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
Configure the tunnel interface as a multipoint GRE interface.
To enable DMVPN Phase 3 on a spoke, you must configure the tunnel interface as multipoint GRE (mGRE), set the tunnel source to the physical interface, and configure an NHRP map to the hub with an authentication string. Phase 3 also uses 'ip nhrp shortcut' and 'ip nhrp redirect' commands, but the question asks for required steps that are common to all Phase 3 spokes. The other options are either not required or are for different phases.
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.
- ✓
Configure the tunnel interface as a multipoint GRE interface.
Why this is correct
DMVPN Phase 3 requires the tunnel to be multipoint GRE (mGRE) to support multiple spoke connections.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Set the tunnel source to the physical interface (e.g., GigabitEthernet0/1).
Why this is correct
The tunnel source must be the physical interface that provides the NBMA address.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Configure an NHRP map to the hub with an authentication string.
Why this is correct
The spoke must have an NHRP map pointing to the hub's NBMA and tunnel addresses, along with authentication for security.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Disable split horizon on the tunnel interface.
Why it's wrong here
While split horizon may need to be disabled for routing protocols in some DMVPN designs, it is not a required step for Phase 3 on the spoke.
- ✗
Configure the tunnel mode as 'tunnel mode ipsec ipv4'.
Why it's wrong here
This command enables IPsec protection, which is optional and not a required step for basic Phase 3 operation.
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
This command enables IPsec protection, which is optional and not a required step for basic Phase 3 operation.
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: Configure the tunnel interface as a multipoint GRE interface. — To enable DMVPN Phase 3 on a spoke, you must configure the tunnel interface as multipoint GRE (mGRE), set the tunnel source to the physical interface, and configure an NHRP map to the hub with an authentication string. Phase 3 also uses 'ip nhrp shortcut' and 'ip nhrp redirect' commands, but the question asks for required steps that are common to all Phase 3 spokes. The other options are either not required or are for different phases.
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
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.
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