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.
Exhibit
Refer to the exhibit.
# ip link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
link/ether 00:11:22:33:44:55 brd ff:ff:ff:ff:ff:ff
3: eth0.10@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
link/ether 00:11:22:33:44:55 brd ff:ff:ff:ff:ff:ff
4: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
link/ether 00:11:22:33:44:55 brd ff:ff:ff:ff:ff:ff
# bridge vlan show
port vlan ids
eth0 1 PVID Egress Untagged
br0 1 PVID Egress Untagged
eth0.10 10
Based on the exhibit, what is the configuration of the network interfaces?
Refer to the exhibit.
# ip link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
link/ether 00:11:22:33:44:55 brd ff:ff:ff:ff:ff:ff
3: eth0.10@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
link/ether 00:11:22:33:44:55 brd ff:ff:ff:ff:ff:ff
4: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
link/ether 00:11:22:33:44:55 brd ff:ff:ff:ff:ff:ff
# bridge vlan show
port vlan ids
eth0 1 PVID Egress Untagged
br0 1 PVID Egress Untagged
eth0.10 10
A
eth0 is directly connected to a bridge; eth0.10 is a separate physical interface; br0 uses VLAN tagging.
Why wrong: eth0.10 is a VLAN subinterface, not physical.
B
eth0 is a VLAN ID 10 access port; eth0.10 is a separate link.
Why wrong: eth0 has PVID 1, not 10.
C
eth0 is a member of VLAN 1 only; eth0.10 is a bridge port.
Why wrong: eth0.10 is a VLAN subinterface, not a bridge port.
D
eth0 is a VLAN trunk port with native VLAN 1; eth0.10 is a VLAN interface for VLAN 10; br0 is a bridge containing eth0.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
eth0 is a VLAN trunk port with native VLAN 1; eth0.10 is a VLAN interface for VLAN 10; br0 is a bridge containing eth0.
Option D is correct because the configuration shows eth0 as a trunk port carrying multiple VLANs, with VLAN 1 as the native VLAN (untagged). The eth0.10 is a VLAN subinterface for VLAN 10, and br0 is a Linux bridge that includes eth0, allowing bridged traffic for the native VLAN while the subinterface handles tagged traffic for VLAN 10.
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.
✗
eth0 is directly connected to a bridge; eth0.10 is a separate physical interface; br0 uses VLAN tagging.
eth0 is a VLAN ID 10 access port; eth0.10 is a separate link.
Why it's wrong here
eth0 has PVID 1, not 10.
✗
eth0 is a member of VLAN 1 only; eth0.10 is a bridge port.
Why it's wrong here
eth0.10 is a VLAN subinterface, not a bridge port.
✓
eth0 is a VLAN trunk port with native VLAN 1; eth0.10 is a VLAN interface for VLAN 10; br0 is a bridge containing eth0.
Why this is correct
Correct interpretation of the exhibit.
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 confuse VLAN subinterfaces with separate physical interfaces or assume eth0 is an access port, failing to recognize that a trunk port with a native VLAN and subinterfaces is the standard configuration for carrying multiple VLANs over a single link.
Detailed technical explanation
How to think about this question
In Linux networking, VLAN subinterfaces (e.g., eth0.10) are created using the 802.1Q standard, where the parent interface (eth0) acts as a trunk port. The bridge br0, when including eth0, typically handles untagged traffic (native VLAN 1), while the subinterface processes tagged frames for VLAN 10. This setup is common in virtualized environments where a physical NIC must carry both management and guest traffic, requiring careful configuration of VLAN filtering on the bridge to avoid traffic leaks.
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: eth0 is a VLAN trunk port with native VLAN 1; eth0.10 is a VLAN interface for VLAN 10; br0 is a bridge containing eth0. — Option D is correct because the configuration shows eth0 as a trunk port carrying multiple VLANs, with VLAN 1 as the native VLAN (untagged). The eth0.10 is a VLAN subinterface for VLAN 10, and br0 is a Linux bridge that includes eth0, allowing bridged traffic for the native VLAN while the subinterface handles tagged traffic for VLAN 10.
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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