- A
Interface indices are preserved after a device reload.
The 'snmp-server ifindex persist' command ensures that ifIndex values remain consistent across reboots.
- B
Interface statistics are cleared on reload.
Why wrong: This command does not affect statistics clearing.
- C
SNMP traps are sent for interface state changes.
Why wrong: That requires 'snmp-server enable traps snmp linkdown linkup'.
- D
The ifIndex is based on the interface name.
Why wrong: The ifIndex is a numeric identifier, not based on name.
Question 1,200 of 2,152
snmp-server ifindex persist: Effect on Interface Indices
This 300-410 practice question tests your understanding of snmp troubleshooting. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
snmp-server ifindex persist
What is the effect of this configuration?
Quick Answer
The answer is that the snmp-server ifindex persist command preserves interface indices after a device reload. This is correct because the command forces the router to store the current ifIndex values in non-volatile memory, ensuring that each interface retains its unique SNMP index even after a reboot. Without this configuration, the router may reassign ifIndex values dynamically upon restart, which can break network management systems (NMS) that rely on consistent identifiers for monitoring and polling. On the Cisco CCNP ENARSI 300-410 exam, this topic tests your understanding of SNMP operational stability and appears in questions about troubleshooting NMS connectivity after a reload. A common trap is assuming ifIndex values are always static by default—they are not, so the command is essential for environments with persistent monitoring. Memory tip: think of “persist” as “permanent index storage”—if you want your SNMP indices to survive a reboot, you must persist them.
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Trap categories for this question
Command / output trap
This command does not affect statistics clearing.
Detailed technical explanation
How to think about this question
Under the hood, each interface's ifIndex is defined in RFC 2863 and is a unique 32-bit integer used by SNMP to identify the interface in MIB-II (RFC 1213). Without persistence, a router may reassign ifIndex values after a reload if the interface numbering order changes (e.g., due to module insertion order), breaking historical data in NMS tools like SolarWinds or PRTG. In real-world scenarios, this command is essential for routers with many subinterfaces or dynamic interfaces (e.g., VLANs, tunnels) to ensure consistent SNMP polling and threshold monitoring across reboots.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
SNMP Troubleshooting — study guide chapter
Learn the concepts, then practise the questions
- →
SNMP Troubleshooting practice questions
Targeted practice on this topic area only
- →
All 300-410 questions
2,152 questions across all exam domains
- →
Cisco CCNP ENARSI 300-410 study guide
Full concept coverage aligned to exam objectives
- →
300-410 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related 300-410 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Layer 3 Technologies practice questions
Practise 300-410 questions linked to Layer 3 Technologies.
EIGRP Troubleshooting practice questions
Practise 300-410 questions linked to EIGRP Troubleshooting.
OSPF Troubleshooting (v2/v3) practice questions
Practise 300-410 questions linked to OSPF Troubleshooting (v2/v3).
BGP Troubleshooting practice questions
Practise 300-410 questions linked to BGP Troubleshooting.
Route Redistribution practice questions
Practise 300-410 questions linked to Route Redistribution.
Policy-Based Routing (PBR) practice questions
Practise 300-410 questions linked to Policy-Based Routing (PBR).
VRF-Lite practice questions
Practise 300-410 questions linked to VRF-Lite.
Route Maps and Route Filtering practice questions
Practise 300-410 questions linked to Route Maps and Route Filtering.
Administrative Distance practice questions
Practise 300-410 questions linked to Administrative Distance.
Route Summarization practice questions
Practise 300-410 questions linked to Route Summarization.
Bidirectional Forwarding Detection (BFD) practice questions
Practise 300-410 questions linked to Bidirectional Forwarding Detection (BFD).
VPN Technologies practice questions
Practise 300-410 questions linked to VPN Technologies.
Practice this exam
Start a free 300-410 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this 300-410 question test?
SNMP Troubleshooting — This question tests SNMP Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More 300-410 practice questions
- Drag and drop the steps to negotiate an IKEv2 IPsec site-to-site tunnel into the correct order, from first to last.
- Drag and drop the steps to troubleshoot an IPsec site-to-site VPN adjacency failure into the correct order, from first t…
- Drag and drop the steps to verify and validate the operational state of an IPsec site-to-site VPN into the correct order…
- Consider the following configuration snippet: ip cef ! interface GigabitEthernet0/0 ip address 10.0.0.1 255.255.255.25…
- A router is configured with 'logging host 10.1.1.100' and 'logging trap informational'. The engineer notices that syslog…
- Drag and drop the steps to configure a GRE tunnel for IPv6 over IPv4 into the correct order, from first to last.
Last reviewed: Jul 4, 2026
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.