- A
The BGP fall-over bfd overrides the track, so the BGP session resets via BFD, but the track remains up, preventing the backup route from being installed.
When BFD is used, the track is ignored for BGP session reset, but the track might still be up, so the static route associated with the track is not removed, causing the backup route to not be used.
- B
The IP SLA frequency is too low, so the track does not detect the failure quickly enough.
Why wrong: The track is not the issue; BFD is faster.
- C
The backup route has a higher administrative distance, so it is not installed until the primary route is removed, but the primary route is still present.
Why wrong: The primary route is removed when the track goes down, but the track is still up.
- D
The track 7 is not applied to the BGP neighbor correctly; it should be under the address-family.
Why wrong: The track can be applied directly to the neighbor.
300-410 IP SLA Practice Question
This 300-410 practice question tests your understanding of ip sla. 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.
A network engineer configures IP SLA to track a BGP next-hop for a backup path. Router R1 has:
ip sla 7
icmp-echo 192.168.3.3 source-ip 10.0.0.1 frequency 5
ip sla schedule 7 life forever start-time now track 7 ip sla 7 reachability router bgp 65001 neighbor 192.168.3.3 remote-as 65003 neighbor 192.168.3.3 fall-over bfd neighbor 192.168.3.3 track 7
But when the link to 192.168.3.3 goes down, the BGP session resets after 5 seconds, but the backup route is not used immediately. What is the root cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"immediately / without restart"Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
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 BGP fall-over bfd overrides the track, so the BGP session resets via BFD, but the track remains up, preventing the backup route from being installed.
The BGP fall-over bfd and track 7 are both configured. When the link goes down, BFD detects the failure quickly and resets the BGP session. However, the track 7 might still be up because the IP SLA probe might be successful via an alternate path, so the tracked route is not removed. The correct answer is that the track 7 is not used because BFD takes precedence, and the track does not influence the route removal.
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 BGP fall-over bfd overrides the track, so the BGP session resets via BFD, but the track remains up, preventing the backup route from being installed.
Why this is correct
When BFD is used, the track is ignored for BGP session reset, but the track might still be up, so the static route associated with the track is not removed, causing the backup route to not be used.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
The IP SLA frequency is too low, so the track does not detect the failure quickly enough.
Why it's wrong here
The track is not the issue; BFD is faster.
- ✗
The backup route has a higher administrative distance, so it is not installed until the primary route is removed, but the primary route is still present.
Why it's wrong here
The primary route is removed when the track goes down, but the track is still up.
- ✗
The track 7 is not applied to the BGP neighbor correctly; it should be under the address-family.
Why it's wrong here
The track can be applied directly to the neighbor.
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?
IP SLA — This question tests IP SLA — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The BGP fall-over bfd overrides the track, so the BGP session resets via BFD, but the track remains up, preventing the backup route from being installed. — The BGP fall-over bfd and track 7 are both configured. When the link goes down, BFD detects the failure quickly and resets the BGP session. However, the track 7 might still be up because the IP SLA probe might be successful via an alternate path, so the tracked route is not removed. The correct answer is that the track 7 is not used because BFD takes precedence, and the track does not influence the route removal.
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: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 19, 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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