The correct answer is that the spoke will send traffic directly to 10.0.0.4 if it has a cached NHRP mapping, otherwise it will forward through the hub. This behavior is rooted in DMVPN Phase 2 and 3 operation, where a spoke initially lacks a direct mapping for the destination spoke’s tunnel-to-physical address pair. Without a cached NHRP entry, the spoke uses the next-hop server (NHS) as the default gateway, encapsulating the packet to the hub’s physical IP. The hub then either forwards the traffic (acting as a proxy) or, if NHRP redirect is enabled, sends a redirect message prompting the source spoke to resolve the destination spoke’s real address via an NHRP resolution request. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of DMVPN spoke-to-spoke communication and the critical role of NHRP caching and redirect mechanisms. A common trap is assuming all DMVPN phases support direct spoke-to-spoke traffic by default—Phase 1 does not. Memory tip: “No cache, no direct path—hub first, then NHRP redirect for the fast track.”
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.
A network engineer configures a DMVPN spoke with the following:
interface Tunnel0
ip address 10.0.0.3 255.255.255.0
ip nhrp network-id 100
ip nhrp nhs 10.0.0.1
tunnel source GigabitEthernet0/0
tunnel mode gre multipoint
ip nhrp map 10.0.0.1 192.168.1.1
ip nhrp map multicast 192.168.1.1
!
What will happen when the spoke tries to send traffic to another spoke (10.0.0.4)?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The spoke will send traffic directly to 10.0.0.4 if it has a cached NHRP mapping, otherwise through the hub.
In DMVPN Phase 2/3, spokes initially send traffic through the hub. The hub then uses NHRP redirect (if configured) to tell the spoke to establish a direct tunnel. Without NHRP redirect on the hub, traffic always goes through the hub.
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.
✓
The spoke will send traffic directly to 10.0.0.4 if it has a cached NHRP mapping, otherwise through the hub.
Why this is correct
Spokes can build direct tunnels if they have learned the mapping via NHRP; otherwise, traffic goes via the hub.
Related concept
Read the scenario before looking for a memorised answer.
✗
The spoke will always send traffic through the hub because of the static multicast map.
Why it's wrong here
The multicast map only affects multicast forwarding, not unicast traffic.
✗
The spoke will send traffic directly to 10.0.0.4 without using the hub.
Why it's wrong here
Without a pre-existing NHRP mapping, the spoke must first learn the mapping, typically via the hub.
✗
The spoke will drop the traffic because it does not have a route to 10.0.0.4.
Why it's wrong here
The spoke will have a route via the hub (e.g., from a dynamic routing protocol).
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
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.
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: The spoke will send traffic directly to 10.0.0.4 if it has a cached NHRP mapping, otherwise through the hub. — In DMVPN Phase 2/3, spokes initially send traffic through the hub. The hub then uses NHRP redirect (if configured) to tell the spoke to establish a direct tunnel. Without NHRP redirect on the hub, traffic always goes through the hub.
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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Question Discussion
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