- A
It statically maps the hub's own NBMA address to the multicast group.
Why wrong: The command is dynamic, not static. Static mapping uses 'ip nhrp map' without the 'dynamic' keyword.
- B
It enables the hub to dynamically add spoke NBMA addresses to the multicast NHRP map for forwarding multicast traffic to all spokes.
This is the correct function: the hub learns spoke addresses dynamically and uses them for multicast replication.
- C
It configures the hub to send NHRP registration requests to the multicast address 224.0.0.1.
Why wrong: NHRP registration requests are sent by spokes to the hub, not the other way around. The hub does not send registration requests.
- D
It disables multicast forwarding over the tunnel interface.
Why wrong: The command enables dynamic multicast mapping, not disables it.
Quick Answer
The answer is that the `ip nhrp map multicast dynamic` command enables the hub to dynamically add spoke NBMA addresses to the multicast NHRP map for forwarding multicast traffic to all spokes. This is correct because in a DMVPN phase 2 or 3 network, the hub must replicate multicast packets—such as EIGRP or OSPF hellos—to each spoke’s unique NBMA address; without this command, the hub would have no way to learn those addresses automatically. On the ENCOR 350-401 exam, this command tests your understanding of how NHRP handles multicast forwarding in a hub-and-spoke topology, often appearing in a configuration snippet where a static `ip nhrp map multicast` is incorrectly used instead. A common trap is confusing this with the `ip nhrp map` command for unicast; remember that “dynamic” is the key for auto-learning spoke addresses. Memory tip: think “Dynamic = Discovery” for spoke multicast replication.
CCNP VPN Technologies Practice Question
This 350-401 practice question tests your understanding of vpn technologies. 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.
Consider the following DMVPN configuration on a hub router:
interface Tunnel0 ip address 10.0.0.1 255.255.255.0 no ip redirects ip nhrp map multicast dynamic ip nhrp network-id 100
tunnel source GigabitEthernet0/0/0 tunnel mode gre multipoint
What is the effect of the command 'ip nhrp map multicast dynamic'?
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 dynamically add spoke NBMA addresses to the multicast NHRP map for forwarding multicast traffic to all spokes.
The 'ip nhrp map multicast dynamic' command allows the hub to dynamically learn the NBMA addresses of spoke routers when they register via NHRP, and then automatically add those addresses to the multicast list for forwarding multicast traffic (such as routing protocol hellos) to all spokes.
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 statically maps the hub's own NBMA address to the multicast group.
Why it's wrong here
The command is dynamic, not static. Static mapping uses 'ip nhrp map' without the 'dynamic' keyword.
- ✓
It enables the hub to dynamically add spoke NBMA addresses to the multicast NHRP map for forwarding multicast traffic to all spokes.
Why this is correct
This is the correct function: the hub learns spoke addresses dynamically and uses them for multicast replication.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
It configures the hub to send NHRP registration requests to the multicast address 224.0.0.1.
Why it's wrong here
NHRP registration requests are sent by spokes to the hub, not the other way around. The hub does not send registration requests.
- ✗
It disables multicast forwarding over the tunnel interface.
Why it's wrong here
The command enables dynamic multicast mapping, not disables it.
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
Keyword trap
The command is dynamic, not static. Static mapping uses 'ip nhrp map' without the 'dynamic' keyword.
Command / output trap
The command is dynamic, not static. Static mapping uses 'ip nhrp map' without the 'dynamic' keyword.
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 350-401 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 350-401 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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VPN Technologies — study guide chapter
Learn the concepts, then practise the questions
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VPN Technologies practice questions
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FAQ
Questions learners often ask
What does this 350-401 question test?
VPN Technologies — This question tests VPN Technologies — 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 dynamically add spoke NBMA addresses to the multicast NHRP map for forwarding multicast traffic to all spokes. — The 'ip nhrp map multicast dynamic' command allows the hub to dynamically learn the NBMA addresses of spoke routers when they register via NHRP, and then automatically add those addresses to the multicast list for forwarding multicast traffic (such as routing protocol hellos) to all spokes.
What should I do if I get this 350-401 question wrong?
Identify which 350-401 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 350-401 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 350-401 exam.
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