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 3000(3) Gi0/0
Session state is UP and 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: 150, Tx Count: 150 Echo function: Active
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 using echo mode, which reduces the load on the control plane because echo packets are processed in hardware.
The output shows that the BFD session is up and using echo function. The echo function allows faster failure detection by sending echo packets that are looped back by the neighbor. The holddown timer is 3000 ms, which is consistent with MinRxInt * Multiplier = 3000 ms. The Rx and Tx counts are equal, indicating bidirectional communication.
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 using echo mode, which reduces the load on the control plane because echo packets are processed in hardware.
Why this is correct
Echo mode offloads detection to the data plane, reducing control plane processing.
- ✗
The BFD session is using echo mode, but the holddown timer is incorrect because echo mode should halve the timer.
Why it's wrong here
Echo mode does not change the holddown timer calculation; it provides faster detection by using a separate echo packet.
- ✗
The BFD session is up, but the echo function is not working because Rx and Tx counts are equal.
Why it's wrong here
Equal Rx and Tx counts are normal for a stable session.
- ✗
The BFD session is up and using echo function, but the neighbor must also have echo mode enabled for it to work.
Why it's wrong here
Echo function is a local feature; the neighbor does not need to enable it. The neighbor simply loops back the echo packets.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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