Quick Answer
The answer is a BFD detection time of 2.5 seconds, calculated by multiplying the MinTxInt of 500,000 microseconds (500 ms) by the Multiplier of 5. This is correct because BFD detection time is always the negotiated transmit interval multiplied by the configured multiplier, representing how long a session can miss hello packets before being declared down. On the Cisco CCNP ENARSI 300-410 exam, this calculation tests your ability to read show bfd neighbors detail output and distinguish between the interval value (in microseconds) and the actual detection time; a common trap is forgetting to convert microseconds to milliseconds or confusing the multiplier with the hold-down timer. To remember, think "Tx times Multiplier equals detection timer"—the multiplier adds tolerance, so a higher value like 5 means the session can withstand more missed packets, but the detection time still scales linearly.
This 300-410 practice question tests your understanding of bidirectional forwarding detection (bfd). Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 runs the following command to verify BFD session details:
R1# show bfd neighbors detail | include (NeighAddr|LD/RD|State|Int|MinTxInt|Multiplier)
NeighAddr LD/RD RH/RS State Int
10.4.4.2 100/200 Up Up Gi0/1
MinTxInt: 500000, MinRxInt: 500000, Multiplier: 5
What does this output indicate?
BFD session is UP with a detection time of 2.5 seconds (500 ms * 5).
Detection time is MinTxInt * Multiplier = 500 ms * 5 = 2500 ms (2.5 seconds).
BFD session is DOWN due to high multiplier.
Why wrong: Session state is UP.
BFD is using echo mode for faster detection.
Why wrong: No echo mode indicated; only async parameters shown.
BFD multiplier is set to 3, not 5.
Why wrong: Multiplier is explicitly 5.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
BFD session is UP with a detection time of 2.5 seconds (500 ms * 5).
The output shows a BFD session with a multiplier of 5 and intervals of 500 ms. The high multiplier may indicate a need for more tolerance, but the session is UP.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
BFD session is UP with a detection time of 2.5 seconds (500 ms * 5).
Why this is correct
Detection time is MinTxInt * Multiplier = 500 ms * 5 = 2500 ms (2.5 seconds).
Related concept
OSPF neighbours must agree on key parameters.
BFD session is DOWN due to high multiplier.
Why it's wrong here
Session state is UP.
BFD is using echo mode for faster detection.
Why it's wrong here
No echo mode indicated; only async parameters shown.
BFD multiplier is set to 3, not 5.
Why it's wrong here
Multiplier is explicitly 5.
Common exam traps
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
No echo mode indicated; only async parameters shown.
Detailed technical explanation
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.
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
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
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.
Bidirectional Forwarding Detection (BFD) — study guide chapter
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FAQ
Bidirectional Forwarding Detection (BFD) — This question tests Bidirectional Forwarding Detection (BFD) — OSPF neighbours must agree on key parameters..
The correct answer is: BFD session is UP with a detection time of 2.5 seconds (500 ms * 5). — The output shows a BFD session with a multiplier of 5 and intervals of 500 ms. The high multiplier may indicate a need for more tolerance, but the session is UP.
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.
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 18, 2026
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