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300-410 Practice Question: Which THREE configuration steps are required to…
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.
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.
- ✓
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.
- ✓
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.
- ✗
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.
Go deeper
Related to this question
Learn chapter
DMVPN and FlexVPN Technologies
Key term
DMVPN Phase 2
DMVPN Phase 2 is an advanced Cisco routing technology that allows spoke routers to communicate directly with one another without sending traffic through a central hub, using dynamic routing protocols and multipoint GRE tunnels.
Key term
DMVPN Phase 3
DMVPN Phase 3 is a Cisco networking technology that allows branch offices to connect directly to each other without always going through a central hub, but with smarter routing that lets the hub control the traffic paths more efficiently.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.