This LPIC-2 practice question tests your understanding of advanced networking configuration. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
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?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
modprobe 8021q; ifconfig eth0 up
Why wrong: Loads the module but does not create the VLAN interface.
vconfig add eth0 10
Why wrong: 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
Standard iproute2 command to create VLAN interface.
ifconfig eth0:10 192.168.10.1/24 up
Why wrong: Creates an alias, not a VLAN-tagged interface.
Answer choices
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
Option C is correct because 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`.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
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.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
ifconfig eth0:10 192.168.10.1/24 up
Why it's wrong here
Creates an alias, not a VLAN-tagged interface.
Common exam traps
The trap here is that 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.
Trap categories for this question
Command / output trap
Older command, not preferred in modern LPIC-2, and may require additional steps.
Detailed technical explanation
Under the hood, the `ip link add link eth0 name eth0.10 type vlan id 10` command creates a virtual network device that uses the 802.1Q encapsulation, adding a 4-byte VLAN tag (TPID 0x8100 and VID 10) to all outgoing Ethernet frames. In real-world scenarios, this is essential for trunking multiple VLANs over a single physical link to a switch, and the `ip` command is preferred because it integrates with the modern `iproute2` suite and supports advanced features like VLAN flags and QinQ.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
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FAQ
Advanced Networking Configuration — This question tests Advanced Networking Configuration — Read the scenario before looking for a memorised answer..
The correct answer is: ip link add link eth0 name eth0.10 type vlan id 10 — Option C is correct because 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`.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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.
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