- A
The negotiated receive interval is 1000 ms.
The local MinRxInt is 1000000 microseconds = 1000 ms, meaning the router can receive packets at that interval.
- B
The negotiated receive interval is 500 ms.
Why wrong: This would be if the local MinRxInt was 500000, but it is 1000000.
- C
The negotiated receive interval is 3000 ms.
Why wrong: This is the holddown timer, not the receive interval.
- D
The negotiated receive interval is 100 ms.
Why wrong: This would be 100000 microseconds, but the value is 1000000.
Question 579 of 2,152
300-410 Negotiated receive interval Practice Question
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. A key principle to apply: negotiated receive interval. 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 on Router R1:
R1# show bfd neighbors detail
IPv4 Sessions NeighborAddr LD/RD Int State Holdown(mult) Intf
10.1.1.2 1/3 Gi0/0 Up 3000(3) Gi0/0
Session state is UP and not using echo function. OurAddr: 10.1.1.1 Handle: 1 Local Diag: 0, Demand mode: 0, Poll bit: 0 MinTxInt: 1000000, MinRxInt: 1000000, Multiplier: 3 Received MinRxInt: 1000000, Received Multiplier: 3 Holddown (hits): 3000(0) Rx Count: 100, Tx Count: 100
Based on this output, what is the BFD session's negotiated receive interval?
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 negotiated receive interval is 1000 ms.
The negotiated receive interval is the maximum of the local MinRxInt (1000000 µs = 1000 ms) and the remote MinTxInt. The remote MinTxInt is not directly shown in the output, but the remote MinRxInt is 1000000 µs. Since the remote MinTxInt must be at least its own MinRxInt (by default, MinTxInt ≥ MinRxInt), the remote MinTxInt is at least 1000000 µs. Thus the maximum is 1000000 µs, giving a negotiated receive interval of 1000 ms. Note that the holdown time (3000 ms) is the product of the multiplier (3) and the negotiated transmit interval, not the receive interval.
Key principle: Negotiated receive interval
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 negotiated receive interval is 1000 ms.
Why this is correct
The local MinRxInt is 1000000 microseconds = 1000 ms, meaning the router can receive packets at that interval.
Related concept
Negotiated receive interval
- ✗
The negotiated receive interval is 500 ms.
Why it's wrong here
This would be if the local MinRxInt was 500000, but it is 1000000.
- ✗
The negotiated receive interval is 3000 ms.
Why it's wrong here
This is the holddown timer, not the receive interval.
- ✗
The negotiated receive interval is 100 ms.
Why it's wrong here
This would be 100000 microseconds, but the value is 1000000.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The holdown time (3000 ms) is often mistaken for the receive interval, but holdown is the detection time (multiplier × negotiated transmit interval).
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Negotiated receive interval
- BFD holdown
- MinRxInt
- MinTxInt
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Negotiated receive interval
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
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Review negotiated receive interval, then practise related 300-410 questions on the same topic to reinforce the concept.
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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) — Negotiated receive interval.
What is the correct answer to this question?
The correct answer is: The negotiated receive interval is 1000 ms. — The negotiated receive interval is the maximum of the local MinRxInt (1000000 µs = 1000 ms) and the remote MinTxInt. The remote MinTxInt is not directly shown in the output, but the remote MinRxInt is 1000000 µs. Since the remote MinTxInt must be at least its own MinRxInt (by default, MinTxInt ≥ MinRxInt), the remote MinTxInt is at least 1000000 µs. Thus the maximum is 1000000 µs, giving a negotiated receive interval of 1000 ms. Note that the holdown time (3000 ms) is the product of the multiplier (3) and the negotiated transmit interval, not the receive interval.
What should I do if I get this 300-410 question wrong?
Review negotiated receive interval, then practise related 300-410 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Negotiated receive interval
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Last reviewed: Jun 18, 2026
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