The answer is that the next hop 10.2.2.2 is not reachable from VRF B, typically because the interface connected to that next hop is not assigned to VRF B. This is correct because VRF route leaking requires that the next-hop address of a leaked route be reachable within the importing VRF’s routing table; if the interface or subnet for 10.2.2.2 belongs only to VRF A, VRF B cannot resolve that next hop, causing the route to be installed but unreachable for forwarding. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of BGP next-hop resolution across VRFs and the common pitfall where route targets are correctly configured for leaking but the underlying VRF interface membership is overlooked. A frequent trap is assuming that a route appearing in both VRFs guarantees reachability, when in fact the next hop must be locally connected or reachable via a valid interface within the destination VRF. Memory tip: “Leak the route, but also leak the next hop—if the next hop’s interface isn’t in the VRF, the packet stops.”
300-410 Network Logging and Syslog Practice Question
This 300-410 practice question tests your understanding of network logging and syslog. 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.
R1# show ip route vrf A
B 10.1.1.0/24 [200/0] via 10.2.2.2, 00:00:10
R1# show ip route vrf B
B 10.1.1.0/24 [200/0] via 10.2.2.2, 00:00:10
Router R2 (in VRF A) can ping 10.1.1.1, but router R3 (in VRF B) cannot. What is the root cause?
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 10.2.2.2 is not reachable from VRF B due to missing interface in VRF B.
The route targets are misconfigured for route leaking. VRF A exports with RT 100:1 and imports RT 100:2. VRF B exports with RT 100:2 and imports RT 100:1. This creates a two-way leak, but the route 10.1.1.0/24 is learned via BGP from R2. If R2 is in VRF A, the route is exported with RT 100:1. VRF B imports RT 100:1, so VRF B should have the route. However, the issue might be that the route is not being advertised to R3 due to BGP next-hop resolution or VRF interface issues. The output shows both VRFs have the route, so the problem is likely that R3 cannot reach the next hop 10.2.2.2 because it is in a different VRF or the interface is not in VRF B. The root cause is that the next hop is not reachable from VRF B.
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 10.2.2.2 is not reachable from VRF B due to missing interface in VRF B.
Why this is correct
The route is present, but the next hop is not in VRF B, so the route is not usable.
Related concept
Read the scenario before looking for a memorised answer.
✗
The route targets are reversed, causing VRF B to not import the route.
Why it's wrong here
VRF B imports RT 100:1, which matches VRF A's export.
✗
BGP is not configured to advertise VPNv4 routes.
Why it's wrong here
The routes are present in both VRFs, so BGP is working.
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.
Network Logging and Syslog — This question tests Network Logging and Syslog — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The next hop 10.2.2.2 is not reachable from VRF B due to missing interface in VRF B. — The route targets are misconfigured for route leaking. VRF A exports with RT 100:1 and imports RT 100:2. VRF B exports with RT 100:2 and imports RT 100:1. This creates a two-way leak, but the route 10.1.1.0/24 is learned via BGP from R2. If R2 is in VRF A, the route is exported with RT 100:1. VRF B imports RT 100:1, so VRF B should have the route. However, the issue might be that the route is not being advertised to R3 due to BGP next-hop resolution or VRF interface issues. The output shows both VRFs have the route, so the problem is likely that R3 cannot reach the next hop 10.2.2.2 because it is in a different VRF or the interface is not in VRF B. The root cause is that the next hop is not reachable from VRF B.
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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