Question 43 of 2,011
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300-410 Practice Question: The default BFD hello timer interval on Cisco…
What is the default BFD hello timer interval on Cisco IOS-XE when BFD is configured on an interface without any explicit timer settings?
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
✓
1000 milliseconds
The default BFD hello interval on Cisco IOS-XE is 1000 milliseconds (1 second) unless overridden by the bfd interval command.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
100 milliseconds
Why it's wrong here
This is not the default; 100 ms is a common configured value but not the IOS-XE default.
- ✗
500 milliseconds
Why it's wrong here
500 ms is not the default; some protocols like OSPF use 500 ms for BFD, but the IOS-XE default is 1000 ms.
- ✓
1000 milliseconds
Why this is correct
The default BFD hello interval is 1000 ms (1 second) on Cisco IOS-XE.
- ✗
2000 milliseconds
Why it's wrong here
2000 ms is not the default; it is a possible configured value but not the default.
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Last reviewed: Jun 18, 2026
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