mediumMultiple Choice
300-410 Practice Question: Runs the following command to verify BFD…
A network engineer runs the following command to verify BFD operation:
R1# show bfd neighbors detail
IPv4 Sessions NeighAddr LD/RD RH/RS State Int
10.1.1.2 1/2 Up Up Gi0/0
Session state is UP and not using echo function. Session type: single-hop Local Diag: 0, Demand mode: 0, Poll bit: 0 MinTxInt: 1000000, MinRxInt: 1000000, Multiplier: 3 Received MinRxInt: 1000000, Received Multiplier: 3 Holddown (hits): 0 (0), Hello (hits): 1000/5 Rx Count: 1000, Rx Interval (ms) min/max/avg: 900/1100/1000 Tx Count: 1000, Tx Interval (ms) min/max/avg: 900/1100/1000
What does this output indicate?
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
✓
BFD session is operating with async mode, intervals at 1 second.
The output shows a BFD session in UP state with consistent transmit and receive intervals around 1000 ms, no echo function, and a multiplier of 3. The session is healthy.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
BFD session is using echo mode for fast failure detection.
Why it's wrong here
The output explicitly states the session is UP and not using echo function, so echo mode is disabled. It is tempting because echo mode is a genuine BFD feature for faster failure detection, and it would be the correct answer had the output shown echo packets being transmitted.
- ✗
BFD session is down and not sending hellos.
Why it's wrong here
The session state reads UP with Rx and Tx counts of 1000, so hellos are actively exchanged. It is tempting because a down session is a common BFD troubleshooting scenario, and the Holddown (hits) field showing 0 could be misread as evidence of a failed or inactive session.
- ✓
BFD session is operating with async mode, intervals at 1 second.
Why this is correct
The absence of the echo function and the MinTxInt/MinRxInt values of 1000000 microseconds confirm asynchronous mode with 1-second intervals. Multiplier 3 gives a 3-second detection time, matching the stated async operation and interval values in the output.
- ✗
BFD session has a holddown timer of 3 seconds.
Why it's wrong here
The Multiplier of 3 is the detection multiplier, not a holddown timer; the holddown field shows 0 hits, and detection time equals multiplier times the negotiated interval. It is tempting because multiplier values are often loosely described as timers, and 3 seconds would be plausible if the interval were one second.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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