LPIC-1 System Architecture Practice Question
After connecting a USB device, the system does not create a device node in /dev. Which command can be used to trigger udev to re-evaluate the device?
⚠ Common exam trap
Test-takers frequently confuse `udevadm trigger` with `udevadm control --reload`; candidates often think reloading rules alone will fix missing device nodes, but without re-triggering uevents, udev does not re-evaluate already-connected devices.
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
✓
udevadm trigger
The correct command is `udevadm trigger`. This command causes udev to re-evaluate all devices by simulating kernel uevents, which forces udev to process rules and create device nodes in /dev for devices that were missed or not properly initialized.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
modprobe
Why it's wrong here
Modprobe loads kernel modules, not directly related to udev device node creation.
- ✗
udevadm control --reload
Why it's wrong here
This reloads udev rules but does not generate events for existing devices.
- ✗
udevadm settle
Why it's wrong here
This waits for all current udev events to finish, but does not trigger new ones.
- ✓
udevadm trigger
Why this is correct
This command generates uevents for existing devices, causing udev to process them again.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.