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.
A server reports packet loss on a bonded interface (mode 4). The switch configuration is verified correct. Running ethtool shows all slaves are connected at 1 Gbps full duplex. Which command should be used to check if the LACP negotiation is successful?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
cat /proc/net/bonding/bond0
Option D is correct because `/proc/net/bonding/bond0` displays the current bonding status, including LACP negotiation details such as the LACP state (e.g., 'negotiated' or 'expired'), partner system MAC, and port key. This is the standard Linux interface to verify that LACP (802.3ad) has successfully established a link aggregation group with the switch.
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.
✗
tcpdump -i bond0 ether proto 0x8809
Why it's wrong here
Captures LACP frames but does not show negotiation status; requires interpretation.
Displays bonding information including LACP state, actor/partner keys, and link status.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
bridge link show
Why it's wrong here
For bridge, not bonding.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse LACP negotiation with general link status or packet capture, assuming `tcpdump` or `ethtool` can show LACP state, when in fact only the bonding pseudo-file provides the detailed per-slave LACP negotiation status.
Trap categories for this question
Command / output trap
Captures LACP frames but does not show negotiation status; requires interpretation.
Detailed technical explanation
How to think about this question
LACP (802.3ad) uses a state machine with variables like Actor_State, Partner_State, and Key to negotiate aggregation. The `/proc/net/bonding/bond0` file exposes these per-slave, showing fields such as 'LACP active' and 'LACP partner'—critical for diagnosing mismatches in key or speed/duplex. In real-world scenarios, a switch may show LACP up but a slave in 'expired' state due to timer mismatches, which only this file reveals.
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: cat /proc/net/bonding/bond0 — Option D is correct because `/proc/net/bonding/bond0` displays the current bonding status, including LACP negotiation details such as the LACP state (e.g., 'negotiated' or 'expired'), partner system MAC, and port key. This is the standard Linux interface to verify that LACP (802.3ad) has successfully established a link aggregation group with the switch.
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.
Are there clue words in this question I should notice?
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
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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