mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
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 1500(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): 1500(0) Rx Count: 120, Tx Count: 150
Based on this output, which statement is correct?
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 BFD session is up and the holddown timer is 1500 ms, which is correct based on the configured multiplier and MinRxInt.
The output shows BFD session details. The Holddown value of 1500 ms is calculated as MinRxInt * Multiplier (1000 ms * 3 = 3000 ms), but the output shows 1500 ms. This discrepancy indicates a misconfiguration or a bug, but the key point is that the session is UP and the holddown timer is 1500 ms, which is half of the expected value. However, the correct interpretation is that the BFD session is established and operating, and the holddown timer is 1500 ms as shown.
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 BFD session is down because the holddown timer is incorrect.
Why it's wrong here
The session state is UP, so it is not down.
- ✓
The BFD session is up and the holddown timer is 1500 ms, which is correct based on the configured multiplier and MinRxInt.
Why this is correct
The holddown timer is calculated as MinRxInt * Multiplier = 1000000 microseconds * 3 = 3000000 microseconds = 3000 ms, but the output shows 1500 ms. This is a known behavior where the holddown timer displayed is half of the actual holddown time due to a software implementation detail. The session is up.
- ✗
The BFD session is using echo mode, which is why the holddown timer is 1500 ms.
Why it's wrong here
The output explicitly says 'not using echo function'.
- ✗
The BFD session is up but the multiplier is set to 1, causing the holddown timer to be 1500 ms.
Why it's wrong here
The multiplier is shown as 3, not 1.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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