- A
The next-hop 192.168.1.1 is not reachable in VRF B because it belongs to VRF A; route leaking does not update the next-hop, causing recursive routing failure.
The route is installed but the next-hop is not in VRF B, so the packet cannot be forwarded.
- B
The route-replicate command requires a route-map to change the next-hop.
Why wrong: Route-replicate does not have an option to change next-hop; it copies the route as-is.
- C
The VRF B has a default route that is conflicting with the leaked route.
Why wrong: A default route would not cause failure to reach the specific prefix; it might even help if the next-hop is reachable.
- D
The interface connected to 192.168.1.1 is not in VRF B, so the packet is dropped by CEF due to VRF mismatch.
This is essentially the same as option A; the next-hop is not in the same VRF, so forwarding fails.
Quick Answer
The answer is that the next-hop remains in the source VRF after route leaking, causing a VRF mismatch that drops the packet. When route-replicate copies a route from VRF A to VRF B, it duplicates the prefix and its next-hop address without altering the next-hop’s VRF association. In this scenario, the next-hop 192.168.1.1 is reachable only within VRF A’s routing table, but VRF B attempts a recursive lookup for that address in its own table, where it does not exist—resulting in a CEF adjacency failure and an unreachable next-hop. On the Cisco CCNP ENARSI 300-410 exam, this question tests your understanding that route leaking is a control-plane operation; it does not install the next-hop’s path into the destination VRF. A common trap is assuming the leaked route is fully functional, but the forwarding plane still requires the next-hop to be present in the destination VRF. Remember the memory tip: “Leak the route, not the next-hop”—the prefix moves, but the gateway stays home.
300-410 Device Access Control Practice Question
This 300-410 practice question tests your understanding of device access control. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 VRF-aware network has two VRFs: VRF A and VRF B. Router R1 is configured with VRF A and VRF B, and route leaking is configured between them using route-replicate. Routes from VRF A are appearing in VRF B, but traffic from VRF B to destinations in VRF A is failing. R1's configuration: ip route vrf A 10.10.10.0 255.255.255.0 192.168.1.1, and route-replicate from VRF A to VRF B. Show ip route vrf B shows the route 10.10.10.0/24 with next-hop 192.168.1.1. However, ping from a device in VRF B to 10.10.10.1 fails. What is the root cause?
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 next-hop 192.168.1.1 is not reachable in VRF B because it belongs to VRF A; route leaking does not update the next-hop, causing recursive routing failure.
When route-replicate copies a route from VRF A to VRF B, it does not change the next-hop address. The next-hop 192.168.1.1 remains in VRF A's routing table and is not reachable within VRF B. As a result, when VRF B tries to forward traffic to 10.10.10.0/24, the recursive lookup for 192.168.1.1 fails because that next-hop is not present in VRF B's routing table, causing the ping to fail.
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 next-hop 192.168.1.1 is not reachable in VRF B because it belongs to VRF A; route leaking does not update the next-hop, causing recursive routing failure.
Why this is correct
The route is installed but the next-hop is not in VRF B, so the packet cannot be forwarded.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The route-replicate command requires a route-map to change the next-hop.
Why it's wrong here
Route-replicate does not have an option to change next-hop; it copies the route as-is.
- ✗
The VRF B has a default route that is conflicting with the leaked route.
Why it's wrong here
A default route would not cause failure to reach the specific prefix; it might even help if the next-hop is reachable.
- ✓
The interface connected to 192.168.1.1 is not in VRF B, so the packet is dropped by CEF due to VRF mismatch.
Why this is correct
This is essentially the same as option A; the next-hop is not in the same VRF, so forwarding fails.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that route leaking automatically adjusts the next-hop, when in fact the next-hop remains unchanged and must be reachable in the destination VRF for traffic to succeed.
Detailed technical explanation
How to think about this question
Route-replicate (or import/export via route-target) copies the route prefix but preserves the original next-hop address. If that next-hop belongs to a different VRF, the receiving VRF must have a route to reach that next-hop, or recursive routing fails. In production, this is often solved by using a route-map to set the next-hop to a loopback or interface that exists in both VRFs, or by ensuring the next-hop is reachable via a global or shared VRF route.
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.
TExam Day Tips
- 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 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.
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FAQ
Questions learners often ask
What does this 300-410 question test?
Device Access Control — This question tests Device Access Control — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The next-hop 192.168.1.1 is not reachable in VRF B because it belongs to VRF A; route leaking does not update the next-hop, causing recursive routing failure. — When route-replicate copies a route from VRF A to VRF B, it does not change the next-hop address. The next-hop 192.168.1.1 remains in VRF A's routing table and is not reachable within VRF B. As a result, when VRF B tries to forward traffic to 10.10.10.0/24, the recursive lookup for 192.168.1.1 fails because that next-hop is not present in VRF B's routing table, causing the ping to fail.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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.
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