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300-410 Practice Question: The default value of the 'hold-down' timer in…
What is the default value of the 'hold-down' timer in IPv6 FHS's ND Snooping feature on Cisco IOS-XE?
⚠ Common exam trap
Cisco often tests the default hold-down timer value by making candidates confuse it with the default reachable time (30 seconds) or the default binding lifetime (300 seconds), leading them to pick a larger number like 15 or 20 seconds.
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
✓
10 seconds
The default hold-down timer for IPv6 First Hop Security's Neighbor Discovery (ND) Snooping feature on Cisco IOS-XE is 10 seconds. This timer defines how long the device maintains a binding entry in the ND snooping database after the last valid advertisement is received, preventing rapid flapping and ensuring stability in the binding table.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
5 seconds
Why it's wrong here
The 5-second value corresponds to the ND reachable-time timer, not the hold-down timer; the hold-down timer in IPv6 FHS ND snooping defaults to 3 seconds, which governs how long a binding remains in a hold-down state after a neighbour unreachability detection (NUD) failure. This option tempts because 5 seconds is a common default for IPv6 ND reachable-time on Cisco IOS-XE, making it plausible for those who confuse the ND reachable-time parameter with the ND snooping hold-down timer.
- ✓
10 seconds
Why this is correct
Correct. The default hold-down timer is 10 seconds.
- ✗
15 seconds
Why it's wrong here
15 seconds is not the default; it is longer than the default.
- ✗
20 seconds
Why it's wrong here
20 seconds is not the default; it is a possible manual setting.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.