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.
An administrator needs to create a Linux bridge (br0) and add an Ethernet interface (eth1) to it for KVM virtual machine networking. Which set of commands accomplishes this task?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
brctl addbr br0; brctl addif br0 eth1
Option C is correct because `brctl addbr br0` creates a new bridge interface named br0, and `brctl addif br0 eth1` adds the physical Ethernet interface eth1 as a port of that bridge. This is the standard sequence using the legacy bridge utilities to set up a bridge for KVM virtual machine networking, where eth1 becomes a member of br0, allowing VMs to share the physical network.
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.
Order is incorrect; bridge must exist before adding interfaces.
✗
ip link add br0 type bridge; ip link set eth1 master br0
Why it's wrong here
While 'iproute2' can manage bridges, this syntax is incomplete and not the traditional method tested on LPIC-2.
✓
brctl addbr br0; brctl addif br0 eth1
Why this is correct
Standard bridge-utils commands to create bridge and add interface.
Related concept
Read the scenario before looking for a memorised answer.
✗
brctl addbr br0; bridge fdb add dev eth1 master br0
Why it's wrong here
The 'bridge fdb' command manages MAC addresses, not interface membership.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the purpose of `bridge fdb` (which manages the forwarding database) with the command to add an interface to a bridge, or they assume that `ip link set ... master` alone is sufficient without bringing the bridge up.
Trap categories for this question
Command / output trap
The 'bridge fdb' command manages MAC addresses, not interface membership.
Detailed technical explanation
How to think about this question
Under the hood, a Linux bridge operates at layer 2, forwarding Ethernet frames between its ports based on MAC address learning. When using `brctl addif`, the kernel attaches the interface as a bridge port, which disables IP networking on that interface and moves its MAC address to the bridge. In KVM environments, the bridge is typically brought up with `ip link set br0 up` after creation, and the host's IP address is assigned to the bridge interface (br0) rather than eth1, allowing VMs to communicate with the external network through the bridge.
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: brctl addbr br0; brctl addif br0 eth1 — Option C is correct because `brctl addbr br0` creates a new bridge interface named br0, and `brctl addif br0 eth1` adds the physical Ethernet interface eth1 as a port of that bridge. This is the standard sequence using the legacy bridge utilities to set up a bridge for KVM virtual machine networking, where eth1 becomes a member of br0, allowing VMs to share the physical network.
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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