- A
The route-map SET-METRIC is not applied to the correct neighbor direction; it should be outbound.
Why wrong: Incorrect direction; inbound sets metric on received routes, which is correct for redistribution.
- B
The OSPF redistribute command lacks the 'metric' keyword to use the BGP metric; default metric 20 is used, causing inconsistency.
Without 'metric' in redistribute, OSPF uses default metric 20, ignoring the BGP metric set by route-map, leading to incorrect cost and potential routing loops.
- C
The OSPF network type mismatch on the link between R1 and R2 causes adjacency issues.
Why wrong: No evidence of adjacency issues; the route is present.
- D
The BGP neighbor 10.0.0.2 is not reachable due to ACL blocking.
Why wrong: No ACL mentioned; BGP session is up if routes are received.
300-410 MPLS Operations Practice Question
This 300-410 practice question tests your understanding of mpls operations. 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.
In an MPLS network, Router R1 is a provider edge (PE) router that redistributes BGP routes into OSPF. The network experiences intermittent loss of reachability to a specific prefix 10.10.10.0/24. R1 configuration includes: 'router ospf 1 redistribute bgp 65000 subnets metric-type 1' and 'router bgp 65000 neighbor 10.0.0.2 route-map SET-METRIC in' with a route-map that sets metric 100. R2, a P router, shows 'show ip route 10.10.10.0' output: 'O E1 10.10.10.0/24 [110/20] via 10.0.0.1, 00:00:15' but traffic 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 OSPF redistribute command lacks the 'metric' keyword to use the BGP metric; default metric 20 is used, causing inconsistency.
The route-map applied to BGP inbound sets metric 100, but redistribution into OSPF uses the BGP metric as the OSPF cost. However, OSPF external route cost is calculated as metric-type 1 cost plus internal cost to the ASBR. The OSPF cost of 20 indicates the BGP metric is not being used correctly; instead, the default metric of 20 is applied because the 'metric' keyword is missing in the redistribute command, causing suboptimal path and potential blackholing due to metric mismatch.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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 route-map SET-METRIC is not applied to the correct neighbor direction; it should be outbound.
Why it's wrong here
Incorrect direction; inbound sets metric on received routes, which is correct for redistribution.
- ✓
The OSPF redistribute command lacks the 'metric' keyword to use the BGP metric; default metric 20 is used, causing inconsistency.
- ✗
The OSPF network type mismatch on the link between R1 and R2 causes adjacency issues.
Why it's wrong here
No evidence of adjacency issues; the route is present.
- ✗
The BGP neighbor 10.0.0.2 is not reachable due to ACL blocking.
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 Operations — This question tests MPLS Operations — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The OSPF redistribute command lacks the 'metric' keyword to use the BGP metric; default metric 20 is used, causing inconsistency. — The route-map applied to BGP inbound sets metric 100, but redistribution into OSPF uses the BGP metric as the OSPF cost. However, OSPF external route cost is calculated as metric-type 1 cost plus internal cost to the ASBR. The OSPF cost of 20 indicates the BGP metric is not being used correctly; instead, the default metric of 20 is applied because the 'metric' keyword is missing in the redistribute command, causing suboptimal path and potential blackholing due to metric mismatch.
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.
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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