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 TWO statements about VLAN tagging are correct?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Untagged frames on a trunk port are typically assigned to the native VLAN
Option C is correct because on a trunk port, frames that do not carry a VLAN tag are considered to belong to the native VLAN. The switch forwards these untagged frames as part of the native VLAN, which is typically VLAN 1 by default but can be configured to any VLAN. This behavior is defined in IEEE 802.1Q and is essential for interoperability with devices that do not support VLAN tagging.
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.
✗
VLAN tagging can only be used with Ethernet
Why it's wrong here
VLAN tagging can also be used with other technologies like Fiber Channel over Ethernet (FCoE).
✗
VLAN tags are always 12 bits
Why it's wrong here
The tag has 4 bytes: TPID (2 bytes), TCI (2 bytes) which includes 3-bit priority, 1-bit CFI, 12-bit VLAN ID.
✓
Untagged frames on a trunk port are typically assigned to the native VLAN
Why this is correct
Standard behavior: untagged traffic on a trunk belongs to native VLAN.
Related concept
Read the scenario before looking for a memorised answer.
✗
VLAN tags are added by the switch, not the host
Why it's wrong here
Hosts can also add VLAN tags if configured as VLAN interfaces.
✓
Linux can use VLAN interfaces with 802.1q tags
Why this is correct
Linux supports VLAN interfaces via ip link or vconfig.
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 assume VLAN tags are always 12 bits, confusing the VLAN ID field with the entire tag, or they think only switches can add tags, missing the fact that hosts (e.g., Linux with 802.1Q interfaces) can also tag frames.
Detailed technical explanation
How to think about this question
In IEEE 802.1Q, the 12-bit VLAN ID allows for up to 4094 usable VLANs (0 and 4095 are reserved). The native VLAN concept is critical on trunk links: when a switch receives an untagged frame on a trunk port, it assumes the frame belongs to the native VLAN and forwards it accordingly; conversely, frames destined for the native VLAN are sent untagged to maintain compatibility with devices that strip tags. This behavior can lead to VLAN hopping attacks if the native VLAN is not properly managed, as an attacker could inject untagged frames to traverse VLANs.
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: Untagged frames on a trunk port are typically assigned to the native VLAN — Option C is correct because on a trunk port, frames that do not carry a VLAN tag are considered to belong to the native VLAN. The switch forwards these untagged frames as part of the native VLAN, which is typically VLAN 1 by default but can be configured to any VLAN. This behavior is defined in IEEE 802.1Q and is essential for interoperability with devices that do not support VLAN tagging.
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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