LPIC-2 Advanced Networking Configuration Practice Question
This LPIC-2 practice question tests your understanding of advanced networking configuration. 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 THREE actions are typically required to configure a VLAN interface on a Linux system?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create the VLAN interface using ip link.
Option A is correct because the `ip link` command is used to create a VLAN interface by specifying the parent physical interface and the VLAN ID (e.g., `ip link add link eth0 name eth0.10 type vlan id 10`). This creates a virtual network interface that tags outgoing frames with the specified 802.1Q VLAN ID and strips tags from incoming frames.
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.
✓
Create the VLAN interface using ip link.
Why this is correct
The VLAN interface is created with a command like 'ip link add link eth0 name eth0.10 type vlan id 10'.
Related concept
Read the scenario before looking for a memorised answer.
✗
Add the physical interface to a bridge.
Why it's wrong here
Bridging is optional and not required for VLAN operation.
Read the scenario before looking for a memorised answer.
✗
Configure iptables rules for the VLAN.
Why it's wrong here
Firewall rules are not required for basic VLAN functionality.
✓
Assign an IP address to the VLAN interface.
Why this is correct
Typically, an IP is assigned to the VLAN interface for communication.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think VLAN configuration requires bridging or iptables rules, but the core steps are simply loading the 8021q module, creating the VLAN interface with `ip link`, and assigning an IP address.
Detailed technical explanation
How to think about this question
The 802.1Q standard inserts a 4-byte VLAN tag (TPID 0x8100, 12-bit VLAN ID, 3-bit priority) into Ethernet frames. The `ip link` command creates a VLAN subinterface that the kernel uses to apply or remove this tag in software, which is essential when the NIC does not support hardware VLAN offloading. In real-world scenarios, you might combine VLAN interfaces with bonding or bridging for redundancy and segmentation.
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 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.
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.
Advanced Networking Configuration — This question tests Advanced Networking Configuration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create the VLAN interface using ip link. — Option A is correct because the `ip link` command is used to create a VLAN interface by specifying the parent physical interface and the VLAN ID (e.g., `ip link add link eth0 name eth0.10 type vlan id 10`). This creates a virtual network interface that tags outgoing frames with the specified 802.1Q VLAN ID and strips tags from incoming frames.
What should I do if I get this LPIC-2 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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Question Discussion
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