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 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 transmit 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 transmit interval is 1000 ms.
The negotiated transmit interval is the maximum of the local MinTxInt and the received MinRxInt. Local MinTxInt is 1000000 microseconds, received MinRxInt is 1000000 microseconds. The maximum is 1000000 microseconds, which is 1000 ms. The BFD session will transmit control packets every 1000 ms.
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 transmit interval is 1000 ms.
Why this is correct
It is the maximum of local MinTxInt and received MinRxInt, both 1000000 microseconds = 1000 ms.
- ✗
The negotiated transmit interval is 500 ms.
Why it's wrong here
This would be if the local MinTxInt was 500000, but it is 1000000.
- ✗
The negotiated transmit interval is 3000 ms.
Why it's wrong here
This is the holddown timer, not the transmit interval.
- ✗
The negotiated transmit interval is 100 ms.
Why it's wrong here
This would be 100000 microseconds, but the values are 1000000 microseconds.
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