305-300 Full Virtualization Practice Question
You are using libvirt to manage a QEMU VM. You want to pass a specific host USB device with vendor ID 1234 and product ID 5678 to the guest. Which XML element is used inside the <devices> block to define this?
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
✓
<hostdev mode='subsystem' type='usb'><source><vendor id='0x1234'/><product id='0x5678'/></source></hostdev>
The <hostdev> element with mode='subsystem' and type='usb' is used for USB passthrough.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
<controller type='usb' index='0'><address vendor='1234'/></controller>
Why it's wrong here
This defines a controller, not a device passthrough.
- ✗
<device type='usb'>1234:5678</device>
Why it's wrong here
This is not valid libvirt XML syntax.
- ✗
<usb-passthrough vendor='1234' product='5678'/>
Why it's wrong here
This is not valid libvirt XML syntax.
- ✓
<hostdev mode='subsystem' type='usb'><source><vendor id='0x1234'/><product id='0x5678'/></source></hostdev>
Why this is correct
Correct XML structure for USB passthrough.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official LPI exam blueprint
This 305-300 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 305-300 exam.