LPIC-2 Advanced Networking Configuration Practice Question
A Linux server requires several VLAN interfaces on eth0. The network switch expects 802.1Q tagged frames for VLAN 10. Which command correctly creates the VLAN interface?
⚠ Common exam trap
Candidates often confuse IP aliasing (using `ifconfig` with a colon, like eth0:10) with VLAN tagging, but aliases do not add 802.1Q tags and are used for multiple IP addresses on the same VLAN, not for separate VLANs.
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
✓
ip link add link eth0 name eth0.10 type vlan id 10
The `ip link` command with the `type vlan id 10` parameter creates a VLAN subinterface on eth0 that tags outgoing frames with VLAN 10 using the 802.1Q standard. This is the modern, recommended method for VLAN interface creation on Linux, replacing legacy tools like `vconfig`.
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 8021q; ifconfig eth0 up
Why it's wrong here
Loads the module but does not create the VLAN interface.
- ✗
vconfig add eth0 10
Why it's wrong here
Older command, not preferred in modern LPIC-2, and may require additional steps.
- ✓
ip link add link eth0 name eth0.10 type vlan id 10
Why this is correct
Standard iproute2 command to create VLAN interface.
- ✗
ifconfig eth0:10 192.168.10.1/24 up
Why it's wrong here
Creates an alias, not a VLAN-tagged interface.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This LPIC-2 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-2 exam.