20+ practice questions focused on DMVPN — one of the most tested topics on the Cisco CCNP ENARSI 300-410 exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start DMVPN PracticeA network engineer is troubleshooting a DMVPN phase 2 hub-and-spoke deployment. The hub router has mGRE and NHRP configured, and spokes register successfully. However, spoke-to-spoke traffic is not being encrypted, even though IPsec profiles are applied to the mGRE tunnel interface on both the hub and spokes. The engineer verifies that the crypto map is not applied to the tunnel interface. What is the most likely cause of this issue?
Explanation: In DMVPN phase 2, spoke-to-spoke dynamic tunnels require IPsec protection. The IPsec profile must be applied to the tunnel interface, not a crypto map. If the crypto map is missing or misapplied, IPsec will not be triggered for spoke-to-spoke traffic.
An engineer is troubleshooting a DMVPN phase 3 network where spoke-to-spoke tunnels are not being established dynamically. The hub router has NHRP redirect enabled, and spokes have NHRP shortcut enabled. The engineer notices that when a spoke sends traffic to another spoke, the hub forwards the traffic but does not send an NHRP redirect. The hub's NHRP configuration includes the command 'ip nhrp redirect'. What is the most likely cause?
Explanation: In DMVPN phase 3, the hub must have 'ip nhrp redirect' enabled on the tunnel interface, and the spoke must have 'ip nhrp shortcut' enabled. Additionally, the hub must have a route to the spoke's subnet; otherwise, the hub will not send an NHRP redirect. The issue is that the hub does not have a route to the spoke's subnet.
A network engineer is troubleshooting a DMVPN phase 2 network where spoke-to-spoke tunnels are established, but traffic between spokes is intermittently dropped. The engineer captures packets and sees that IPsec packets are being fragmented. The tunnel interface MTU is set to 1400 bytes, and the physical interface MTU is 1500 bytes. The engineer also notices that the IPsec transform set uses ESP with AES-256 and SHA-256. What is the most likely cause of the intermittent drops?
Explanation: IPsec adds overhead (ESP header, trailer, and authentication data). With AES-256 and SHA-256, the overhead can be around 50-60 bytes. If the tunnel MTU is set to 1400, the effective payload MTU is lower. Fragmentation can cause drops if the DF bit is set or if intermediate routers drop fragments. The issue is that the tunnel MTU is too high for the IPsec overhead, causing fragmentation.
An engineer is troubleshooting a DMVPN phase 3 network where spokes are unable to reach the hub's LAN subnet. The hub router is running EIGRP over the DMVPN tunnel interface, and the spokes are learning the hub's LAN route. However, pings from a spoke to the hub's LAN IP fail. The engineer checks the hub's routing table and sees the spoke's LAN route. The hub's tunnel interface has 'ip nhrp redirect' and 'ip nhrp shortcut' enabled. What is the most likely cause?
Explanation: In DMVPN phase 3, the hub's NHRP redirect and shortcut features can cause the hub to forward traffic to the spoke's LAN via the spoke's tunnel IP, but if the spoke's LAN subnet is not advertised via EIGRP, the hub may not have a route. However, the issue is that the hub's EIGRP is not advertising the hub's LAN subnet to the spokes, or the spokes are not receiving the route. The most common cause is that the hub's EIGRP network statement does not include the LAN subnet.
A network engineer is troubleshooting a DMVPN phase 2 network where the hub router is not forming an NHRP adjacency with a spoke. The spoke router is configured with 'ip nhrp nhs 10.0.0.1' and 'ip nhrp map 10.0.0.1 192.168.1.1'. The hub's tunnel interface IP is 10.0.0.1, and the physical interface IP is 192.168.1.1. The engineer pings the hub's tunnel IP from the spoke and it succeeds. However, 'show ip nhrp' on the spoke shows no NHRP entries. What is the most likely cause?
Explanation: NHRP registration requires the spoke to send a Registration Request to the hub. If the hub does not respond, the spoke will not have NHRP entries. A common cause is that the hub's NHRP authentication is configured with a password, but the spoke's NHRP authentication is missing or mismatched.
+15 more DMVPN questions available
Practice all DMVPN questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of DMVPN. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
DMVPN questions on the 300-410 frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. DMVPN is tested as part of the Cisco CCNP ENARSI 300-410 blueprint. Practicing with targeted DMVPN questions ensures you can handle any format or difficulty that appears.
Yes. Courseiva provides free 300-410 practice questions across all exam topics and domains. The platform includes topic-based practice, mock exams, missed-question review, bookmarked questions, and readiness tracking — no account required.
Difficulty is subjective, but DMVPN is a high-priority exam concept tested in multiple ways — direct recall, scenario analysis, and command-output interpretation. Consistent practice is the best way to build confidence.
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