easyMultiple 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 snmp mib ifmib ifindex
ifIndex: 1
Interface: GigabitEthernet0/0
Description: GigabitEthernet0/0
ifIndex: 2
Interface: GigabitEthernet0/1
Description: GigabitEthernet0/1
ifIndex: 3
Interface: Loopback0
Description: Loopback0
ifIndex: 10
Interface: Tunnel0
Description: Tunnel0
Based on this output, which statement is correct?
⚠ Common exam trap
Cisco often tests the misconception that ifIndex values are assigned sequentially starting from 0 or 1 without gaps, but the output shows non-sequential values (e.g., Tunnel0 with ifIndex 10) to trap candidates who assume a simple 1-to-1 order.
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 ifIndex for Loopback0 is 3.
The output of 'show snmp mib ifmib ifindex' displays the ifIndex values assigned to each interface by the SNMP agent. The table clearly shows Loopback0 with ifIndex 3, making option A correct. ifIndex values are not guaranteed to be sequential or start from 0; they are assigned dynamically and can have gaps, as seen with Tunnel0 having ifIndex 10.
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 ifIndex for Loopback0 is 3.
Why this is correct
The output clearly shows Loopback0 with ifIndex 3.
- ✗
The ifIndex values are assigned sequentially starting from 0.
Why it's wrong here
The ifIndex values start from 1 and are not necessarily sequential (note the jump to 10).
- ✗
GigabitEthernet0/0 has ifIndex 2.
Why it's wrong here
GigabitEthernet0/0 has ifIndex 1.
- ✗
Tunnel0 has ifIndex 3.
Why it's wrong here
Tunnel0 has ifIndex 10.
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JA
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.