- A
It maps the BFD session to the interface, enabling BFD for all static routes using that interface.
Why wrong: The 'bfd map' command is specific to a next-hop and prefix; it does not apply to all static routes on the interface.
- B
It creates a BFD session to the next-hop 192.168.1.2 and associates it with the static route to 10.0.0.0/24.
Correct. The 'bfd map' command creates a BFD session to the specified next-hop and ties it to the static route so that the route is withdrawn if BFD goes down.
- C
It maps the BFD session to the OSPF process, which is incorrect for static routes.
Why wrong: Static routes do not use OSPF; the 'bfd map' is specifically for static routes.
- D
It is used to configure BFD for multiple static routes simultaneously.
Why wrong: Each static route requires its own 'bfd map' command.
Quick Answer
The correct answer is that the 'bfd map' command creates a BFD session to the next-hop 192.168.1.2 and associates it with the static route to 10.0.0.0/24. This is necessary because, unlike dynamic routing protocols which automatically negotiate BFD peers, static routes require an explicit mapping to link the BFD session with a specific destination prefix and next-hop. When BFD detects a failure on the link between 192.168.1.1 and 192.168.1.2, it immediately signals the routing table to remove the associated static route, providing sub-second convergence without relying on routing protocol timers. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of BFD static routes mapping as a distinct configuration step—a common trap is assuming that enabling BFD on the interface alone is sufficient for static routes, but the 'bfd map' command is mandatory to bind the session to the route. Remember the memory tip: "Map it or miss it"—without the map, BFD ignores the static route entirely.
300-410 Bidirectional Forwarding Detection (BFD) Practice Question
This 300-410 practice question tests your understanding of bidirectional forwarding detection (bfd). 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 router has the following BFD configuration for a static route:
ip route 10.0.0.0 255.255.255.0 192.168.1.2
bfd map 192.168.1.2 10.0.0.0 255.255.255.0
interface GigabitEthernet0/0 ip address 192.168.1.1 255.255.255.0
bfd interval 100 min_rx 100 multiplier 3 !
What is the purpose of the 'bfd map' command in this context?
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
It creates a BFD session to the next-hop 192.168.1.2 and associates it with the static route to 10.0.0.0/24.
For static routes, BFD must be explicitly mapped to the next-hop and destination prefix. The 'bfd map' command associates a BFD session with a static route so that if BFD detects a failure, the static route is removed from the routing table.
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.
- ✗
It maps the BFD session to the interface, enabling BFD for all static routes using that interface.
Why it's wrong here
The 'bfd map' command is specific to a next-hop and prefix; it does not apply to all static routes on the interface.
- ✓
It creates a BFD session to the next-hop 192.168.1.2 and associates it with the static route to 10.0.0.0/24.
Why this is correct
Correct. The 'bfd map' command creates a BFD session to the specified next-hop and ties it to the static route so that the route is withdrawn if BFD goes down.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
It maps the BFD session to the OSPF process, which is incorrect for static routes.
Why it's wrong here
Static routes do not use OSPF; the 'bfd map' is specifically for static routes.
- ✗
It is used to configure BFD for multiple static routes simultaneously.
Why it's wrong here
Each static route requires its own 'bfd map' command.
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.
Trap categories for this question
Command / output trap
The 'bfd map' command is specific to a next-hop and prefix; it does not apply to all static routes on the interface.
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?
Bidirectional Forwarding Detection (BFD) — This question tests Bidirectional Forwarding Detection (BFD) — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: It creates a BFD session to the next-hop 192.168.1.2 and associates it with the static route to 10.0.0.0/24. — For static routes, BFD must be explicitly mapped to the next-hop and destination prefix. The 'bfd map' command associates a BFD session with a static route so that if BFD detects a failure, the static route is removed from the routing table.
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.
About these practice questions
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Same concept, more angles
1 more ways this is tested on 300-410
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A network engineer runs the following command to troubleshoot BFD with static routes: R1# show ip route 10.8.8.0/24 Routing entry for 10.8.8.0/24 Known via "static", distance 1, metric 0 Routing Descriptor Blocks: * 10.9.9.2, via GigabitEthernet0/3 Route metric is 0, traffic share count is 1 BFD enabled, BFD state: UP What does this output indicate?
medium- ✓ A.Static route is installed with BFD tracking, and BFD session is UP.
- B.Static route is not using BFD.
- C.BFD state is DOWN, so the static route is removed.
- D.Static route is using BFD only for IPv6.
Why A: The output shows that BFD is enabled for the static route and the BFD state is UP, meaning the next hop is reachable and BFD is providing fast failure detection.
Last reviewed: Jun 18, 2026
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