The answer is using the 'ip' command and the `/etc/network/interfaces` file. These are valid methods to configure network interfaces on a Linux system because they represent the two fundamental approaches: runtime configuration with the `ip` tool, which applies changes immediately but does not survive a reboot, and persistent configuration via the interfaces file, which defines static or DHCP settings that are applied automatically at boot by the `ifup` and `ifdown` utilities on Debian-based distributions. On the LPIC-1 exam, this question tests your understanding of the distinction between temporary and persistent network configuration, a core objective in the System Administration domain. A common trap is confusing the `ifconfig` command, which is deprecated and not covered as a valid method for modern LPIC-1 objectives, with the `ip` command from the iproute2 suite. Remember the memory tip: "ip for instant, file for forever" — the `ip` command changes the interface on the fly, while the interfaces file makes those changes stick across reboots.
LPIC-1 Essential System Services and Networking Practice Question
This LPIC-1 practice question tests your understanding of essential system services and networking. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Which TWO of the following are valid methods to configure network interfaces on a Linux system? (Choose two.)
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 file.
Option A is correct because the `/etc/network/interfaces` file is the primary configuration file for network interfaces on Debian-based Linux distributions (e.g., Ubuntu). It allows static or dynamic (DHCP) configuration of interfaces using directives like `iface`, `address`, and `netmask`, and is read by the `ifup` and `ifdown` commands at boot or on demand.
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.
✓
Editing /etc/network/interfaces file.
Why this is correct
Used by Debian-based systems.
Related concept
Read the scenario before looking for a memorised answer.
✗
Using the 'ifconfig' command.
Why it's wrong here
Deprecated for configuration, but still used for viewing.
✓
Using the 'ip' command.
Why this is correct
'ip' can configure interfaces.
Related concept
Read the scenario before looking for a memorised answer.
Path is /etc/sysconfig/network-scripts/ifcfg-*, not directly editing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse temporary runtime commands (like `ifconfig` and `route`) with persistent configuration methods, or they assume a distribution-specific path like `/etc/sysconfig/network-scripts/` is universally valid across all Linux systems.
Detailed technical explanation
How to think about this question
The `/etc/network/interfaces` file uses a stanza-based syntax where each interface is defined with an `auto` line to enable at boot and an `iface` line specifying the address family (inet for IPv4, inet6 for IPv6) and method (static, dhcp, etc.). The `ip` command from the iproute2 suite is the modern replacement for both `ifconfig` and `route`, and it can also persist configurations when used with network scripts or systemd-networkd, but by itself it does not write to configuration files.
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 network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
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.
Essential System Services and Networking — This question tests Essential System Services and Networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Editing /etc/network/interfaces file. — Option A is correct because the `/etc/network/interfaces` file is the primary configuration file for network interfaces on Debian-based Linux distributions (e.g., Ubuntu). It allows static or dynamic (DHCP) configuration of interfaces using directives like `iface`, `address`, and `netmask`, and is read by the `ifup` and `ifdown` commands at boot or on demand.
What should I do if I get this LPIC-1 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.
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This LPIC-1 practice question is part of Courseiva's free LPI 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 LPIC-1 exam.
Question Discussion
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