LFCS Networking Practice Question
A system administrator wants to ensure that network interfaces receive predictable names based on firmware/BIOS topology rather than kernel enumeration. Which naming scheme should be enabled in GRUB?
⚠ Common exam trap
It's easy for candidates to assume `net.ifnames=0` enables predictable naming, when in fact it disables it. The correct parameter to enable topology-based naming is `net.ifnames=1` (or leaving the default setting).
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
✓
net.ifnames=1
Setting `net.ifnames=1` in GRUB enables the predictable network interface naming scheme based on firmware/BIOS topology by instructing systemd-udev to apply naming rules that produce names like enp0s3 or ens33, which reflect the hardware topology. Conversely, `net.ifnames=0` disables predictable naming and reverts to legacy ethX names.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
net.ifnames=0
Why it's wrong here
Incorrect. `net.ifnames=0` disables predictable naming, forcing kernel-style ethX names. It is the opposite of what the question asks.
- ✗
ifrename=enable
Why it's wrong here
Incorrect: `ifrename=enable` is not a valid GRUB parameter for controlling naming schemes.
- ✓
net.ifnames=1
Why this is correct
Correct. `net.ifnames=1` enables predictable naming based on firmware/BIOS topology, producing names like enp0s3 or ens33.
- ✗
biosdevname=0
Why it's wrong here
Incorrect: `biosdevname=0` disables the Dell-specific biosdevname scheme, but the question asks for a firmware/BIOS topology-based scheme, which is enabled by `net.ifnames=0`.
Quick reference
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| Storage Class | Min Duration | Retrieval | Use Case |
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This LFCS practice question is part of Courseiva's free Linux Foundation 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 LFCS exam.