- A
net.ifnames=0
Why wrong: Incorrect. `net.ifnames=0` disables predictable naming, forcing kernel-style ethX names. It is the opposite of what the question asks.
- B
ifrename=enable
Why wrong: Incorrect: `ifrename=enable` is not a valid GRUB parameter for controlling naming schemes.
- C
net.ifnames=1
Correct. `net.ifnames=1` enables predictable naming based on firmware/BIOS topology, producing names like enp0s3 or ens33.
- D
biosdevname=0
Why wrong: 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`.
Question 85 of 513
LFCS Networking Practice Question
This LFCS practice question tests your understanding of networking. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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?
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.
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.
- ✗
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
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`.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often 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).
Detailed technical explanation
How to think about this question
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.
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 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.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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.
- →
Networking — study guide chapter
Learn the concepts, then practise the questions
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FAQ
Questions learners often ask
What does this LFCS question test?
Networking — This question tests Networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this LFCS 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 →
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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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