LPIC-2 Advanced Networking Configuration Practice Question
This LPIC-2 practice question tests your understanding of advanced networking configuration. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 conditions must be met for a Linux bridge to forward traffic between its ports?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The bridge has at least two ports added.
Option B is correct because a Linux bridge requires at least two ports to forward traffic; a bridge with only one port cannot forward frames between interfaces. Option C is correct because the bridge kernel module must be loaded (e.g., via `modprobe bridge`) to provide the bridging functionality; without it, bridge operations are impossible.
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.
✗
The bridge has an IP address.
Why it's wrong here
A bridge can forward L2 traffic without an IP.
✓
The bridge has at least two ports added.
Why this is correct
Forwarding between ports requires at least two interfaces in the bridge.
Related concept
Read the scenario before looking for a memorised answer.
✓
The kernel module bridge is loaded.
Why this is correct
The bridge functionality is provided by the kernel module.
Related concept
Read the scenario before looking for a memorised answer.
✗
The interfaces are in promiscuous mode.
Why it's wrong here
Interfaces are automatically placed in promiscuous mode when added to a bridge.
✗
Spanning Tree Protocol is disabled.
Why it's wrong here
STP can be enabled or disabled; it is not a requirement for forwarding.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the requirements for a bridge with those for a router, incorrectly assuming an IP address is necessary for forwarding, or they forget that the bridge kernel module must be explicitly loaded in Linux.
Detailed technical explanation
How to think about this question
Under the hood, a Linux bridge operates as a virtual Layer 2 switch, using the kernel's bridging code (bridge.ko) to maintain a forwarding database (FDB) that maps MAC addresses to ports. Traffic is forwarded based on the FDB, and STP (IEEE 802.1D) is enabled by default to prevent broadcast storms, but it can be disabled without breaking basic forwarding. In real-world scenarios, a bridge with only one port is essentially a loopback interface and cannot forward frames between distinct network segments.
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 practitioner preparing for the LPIC-2 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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: The bridge has at least two ports added. — Option B is correct because a Linux bridge requires at least two ports to forward traffic; a bridge with only one port cannot forward frames between interfaces. Option C is correct because the bridge kernel module must be loaded (e.g., via `modprobe bridge`) to provide the bridging functionality; without it, bridge operations are impossible.
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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