Question 1harddrag order
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Quick Answer
The answer is to examine VPNv4 route exchange between PEs as the final step. This is correct because MPLS L3VPN troubleshooting follows a logical bottom-up hierarchy: you must first confirm the local PE-CE adjacency and VRF configuration, then verify the MPLS label-switched path to the remote PE, and only after those layers are healthy can you check whether VPNv4 routes are actually being exchanged between the provider edges. On the Cisco CCNP ENARSI 300-410 exam, this drag-and-drop question tests your ability to sequence troubleshooting steps for MPLS L3VPN connectivity failures, with a common trap being to jump straight to BGP VPNv4 peering without first validating the underlying MPLS LSP or the VRF interface status. A reliable memory tip is the acronym “P-V-L-B”: start with the PE-CE adjacency, then the VRF, then the LSP, and finally BGP VPNv4 exchange.
300-410 MPLS L3VPN Practice Question
This 300-410 practice question tests your understanding of mpls l3vpn. 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.
Drag and drop the steps to troubleshoot an MPLS L3VPN adjacency or connectivity failure into the correct order, from first to last.
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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
✓
Check PE-CE BGP adjacency state
Troubleshooting begins by verifying the PE-CE adjacency with 'show ip bgp vpnv4 vrf <name> summary'. If the adjacency is down, check the VRF interface status and IP connectivity using ping. Then verify that the VRF is correctly configured with 'show vrf'. Next, confirm that the MPLS LSP to the remote PE is functional using 'show mpls lsp'. Finally, check that the VPNv4 routes are being exchanged between PEs with 'show bgp vpnv4 unicast all'.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
- OSPF neighbours must agree on key parameters.
- Router ID selection can affect neighbour relationships and LSDB output.
- OSPF cost influences the preferred path.
- A route can appear in OSPF information but not become the installed route.
TExam Day Tips
- Check area mismatch first when OSPF adjacency fails.
- Review passive interfaces when a network is advertised but no neighbour forms.
- Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Got this wrong? Here's your next step.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
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FAQ
Questions learners often ask
What does this 300-410 question test?
MPLS L3VPN — This question tests MPLS L3VPN — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: Check PE-CE BGP adjacency state — Troubleshooting begins by verifying the PE-CE adjacency with 'show ip bgp vpnv4 vrf <name> summary'. If the adjacency is down, check the VRF interface status and IP connectivity using ping. Then verify that the VRF is correctly configured with 'show vrf'. Next, confirm that the MPLS LSP to the remote PE is functional using 'show mpls lsp'. Finally, check that the VPNv4 routes are being exchanged between PEs with 'show bgp vpnv4 unicast all'.
What should I do if I get this 300-410 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 18, 2026
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