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300-410 Practice Question: Snmp-server ifindex persist What is the effect of…
snmp-server ifindex persist
What is the effect of this configuration?
⚠ Common exam trap
Cisco often tests the misconception that `snmp-server ifindex persist` affects SNMP trap generation or interface statistics, when in reality it only ensures the ifIndex values remain constant across reloads.
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
✓
Interface indices are preserved after a device reload.
The `snmp-server ifindex persist` command configures the router to save interface index (ifIndex) values in non-volatile memory (the private configuration or NVRAM) so that after a reload, each interface retains its original ifIndex. This is critical for SNMP management systems that rely on stable ifIndex values to correlate interface statistics across reboots, as the default behavior is to assign ifIndex values dynamically based on the order interfaces are discovered, which can change after a reload.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Interface indices are preserved after a device reload.
Why this is correct
The 'snmp-server ifindex persist' command ensures that ifIndex values remain consistent across reboots.
- ✗
Interface statistics are cleared on reload.
Why it's wrong here
This command does not affect statistics clearing.
- ✗
SNMP traps are sent for interface state changes.
Why it's wrong here
That requires 'snmp-server enable traps snmp linkdown linkup'.
- ✗
The ifIndex is based on the interface name.
Why it's wrong here
The ifIndex is a numeric identifier, not based on name.
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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.