This LFCS practice question tests your understanding of networking. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
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?
net.ifnames=0
Enables predictable naming based on firmware topology.
ifrename=enable
Why wrong: Not a valid kernel parameter.
net.ifnames=1
Why wrong: Disables predictable naming, using ethX style.
biosdevname=0
Why wrong: biosdevname is an older tool; net.ifnames is the current method.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
net.ifnames=0
Option A is correct because setting `net.ifnames=0` in GRUB disables the predictable network interface naming scheme (based on firmware/BIOS topology) and reverts to the traditional kernel enumeration (e.g., eth0, eth1). This is the standard kernel parameter used to control systemd's udev naming policy, ensuring names like enp0s3 or ens33 are replaced with legacy names.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
net.ifnames=0
Why this is correct
Enables predictable naming based on firmware topology.
Related concept
Read the scenario before looking for a memorised answer.
ifrename=enable
Why it's wrong here
Not a valid kernel parameter.
net.ifnames=1
Why it's wrong here
Disables predictable naming, using ethX style.
biosdevname=0
Why it's wrong here
biosdevname is an older tool; net.ifnames is the current method.
Common exam traps
The trap here is that candidates confuse `net.ifnames=0` with enabling predictable naming, when in fact it disables it, and they may also mistake `biosdevname=0` as the correct parameter for enabling topology-based names, whereas biosdevname is a separate, older scheme from Dell.
Detailed technical explanation
The predictable naming scheme is implemented by systemd's udev via rules in `/usr/lib/udev/rules.d/80-net-setup-link.rules`, which uses information from ACPI (_DSM) or PCI slot firmware to generate names like enp0s3 (Ethernet, PCI bus 0, slot 3). The `net.ifnames` parameter controls whether udev applies these rules; when set to 0, udev falls back to kernel-generated names (ethX). In real-world scenarios, disabling predictable naming is often necessary for compatibility with legacy scripts or network configurations that hardcode eth0/eth1.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the LFCS 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
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FAQ
Networking — This question tests Networking — Read the scenario before looking for a memorised answer..
The correct answer is: net.ifnames=0 — Option A is correct because setting `net.ifnames=0` in GRUB disables the predictable network interface naming scheme (based on firmware/BIOS topology) and reverts to the traditional kernel enumeration (e.g., eth0, eth1). This is the standard kernel parameter used to control systemd's udev naming policy, ensuring names like enp0s3 or ens33 are replaced with legacy names.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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.
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