LFCS Networking Practice Question
Which TWO are valid methods to configure a network interface on a Linux system?
⚠ Common exam trap
Candidates often confuse global network configuration files (like /etc/sysconfig/network) with per-interface configuration files, or mistake sysctl for a tool that can set interface IP addresses, when it only modifies kernel parameters unrelated to interface addressing.
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
✓
Editing /etc/network/interfaces
/etc/network/interfaces is the traditional configuration file used by the ifup/ifdown system on Debian-based distributions to define network interfaces, including IP addresses, netmasks, and gateways. This file is parsed by the ifup command to bring interfaces up with the specified settings, making it a valid method for persistent network configuration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Using sysctl to set net.ipv4.conf.eth0.forwarding
Why it's wrong here
sysctl is for kernel parameters, not for configuring interface IP addresses.
- ✗
Using systemctl enable network.service
Why it's wrong here
This enables the network service but does not configure interfaces.
- ✓
Editing /etc/network/interfaces
Why this is correct
This file is used by ifupdown on Debian/Ubuntu systems.
- ✓
Using nmcli connection add
Why this is correct
nmcli is the command-line tool for NetworkManager.
- ✗
Editing /etc/sysconfig/network
Why it's wrong here
This file contains hostname and global settings, not interface configuration.
Visual reference
Go deeper
Related to this question
About these practice questions
Courseiva writes every LFCS question from scratch — 507 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
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.