- A
The spokes are missing the 'ip nhrp shortcut' command on the tunnel interface, so they do not install the direct route.
The 'ip nhrp shortcut' command is required on spokes to allow them to use the NHRP-learned direct path. Without it, the spoke will continue to use the hub as the next hop.
- B
The hub is configured with 'ip nhrp redirect' but the spokes are configured with 'ip nhrp server-only', which prevents them from sending redirects.
Why wrong: Spokes do not need to send redirects; they need to receive them. The 'server-only' command is for hubs, not spokes.
- C
The tunnel interface has 'ip mtu' set too low, causing fragmentation and preventing the NHRP registration.
Why wrong: NHRP registration uses small packets and is not typically affected by MTU. The scenario states NHRP is working.
- D
The spoke-to-spoke tunnel uses IPsec, and the transform set is mismatched, causing the tunnel to fail.
Why wrong: The scenario states the spoke-to-spoke tunnel is up, so IPsec is working.
300-410 NetFlow and Flexible NetFlow Practice Question
This 300-410 practice question tests your understanding of netflow and flexible netflow. 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.
An engineer configures a DMVPN Phase 2 network. Spoke-to-spoke tunnels are expected to form dynamically. However, when a spoke tries to reach another spoke, traffic is still sent through the hub. The engineer verifies that NHRP is working and that the spoke-to-spoke tunnel is up. Which is the most likely explanation?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
The spokes are missing the 'ip nhrp shortcut' command on the tunnel interface, so they do not install the direct route.
In DMVPN Phase 2, spoke-to-spoke tunnels require that the spokes have a direct route to each other's tunnel IP addresses. This is achieved through NHRP redirect and shortcut routes. However, a common edge case is that the spoke routers are configured with 'ip nhrp redirect' on the hub but the spokes are missing 'ip nhrp shortcut' on their tunnel interfaces. Without the shortcut command, the spoke will not install the NHRP-learned route into the routing table, so traffic continues to go through the hub.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 spokes are missing the 'ip nhrp shortcut' command on the tunnel interface, so they do not install the direct route.
Why this is correct
The 'ip nhrp shortcut' command is required on spokes to allow them to use the NHRP-learned direct path. Without it, the spoke will continue to use the hub as the next hop.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
The hub is configured with 'ip nhrp redirect' but the spokes are configured with 'ip nhrp server-only', which prevents them from sending redirects.
Why it's wrong here
Spokes do not need to send redirects; they need to receive them. The 'server-only' command is for hubs, not spokes.
- ✗
The tunnel interface has 'ip mtu' set too low, causing fragmentation and preventing the NHRP registration.
Why it's wrong here
NHRP registration uses small packets and is not typically affected by MTU. The scenario states NHRP is working.
- ✗
The spoke-to-spoke tunnel uses IPsec, and the transform set is mismatched, causing the tunnel to fail.
Why it's wrong here
The scenario states the spoke-to-spoke tunnel is up, so IPsec is working.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Trap categories for this question
Command / output trap
Spokes do not need to send redirects; they need to receive them. The 'server-only' command is for hubs, not spokes.
Scenario analysis trap
NHRP registration uses small packets and is not typically affected by MTU. The scenario states NHRP is working.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this 300-410 question test?
NetFlow and Flexible NetFlow — This question tests NetFlow and Flexible NetFlow — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The spokes are missing the 'ip nhrp shortcut' command on the tunnel interface, so they do not install the direct route. — In DMVPN Phase 2, spoke-to-spoke tunnels require that the spokes have a direct route to each other's tunnel IP addresses. This is achieved through NHRP redirect and shortcut routes. However, a common edge case is that the spoke routers are configured with 'ip nhrp redirect' on the hub but the spokes are missing 'ip nhrp shortcut' on their tunnel interfaces. Without the shortcut command, the spoke will not install the NHRP-learned route into the routing table, so traffic continues to go through the hub.
What should I do if I get this 300-410 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 19, 2026
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