This LFCS practice question tests your understanding of operation of running systems. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 system administrator needs to monitor real-time network traffic on a specific interface (eth0). Which TWO tools can be used for packet-level analysis?
tshark -i eth0
CLI version of Wireshark for packet capture.
tcpdump -i eth0
Captures packets on eth0.
iftop
Why wrong: Shows bandwidth usage per connection, not packet-level analysis.
wireshark
Why wrong: GUI tool, not typically used for remote CLI monitoring.
netstat -i
Why wrong: Shows interface statistics, not packet capture.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
tshark -i eth0
A is correct because tshark is the command-line version of Wireshark, capable of capturing and analyzing packets in real time on a specific interface using the -i flag. It provides detailed packet-level inspection, including protocol dissection, which is essential for network traffic analysis.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
tshark -i eth0
Why this is correct
CLI version of Wireshark for packet capture.
Related concept
Read the scenario before looking for a memorised answer.
tcpdump -i eth0
Why this is correct
Captures packets on eth0.
Related concept
Read the scenario before looking for a memorised answer.
iftop
Why it's wrong here
Shows bandwidth usage per connection, not packet-level analysis.
wireshark
Why it's wrong here
GUI tool, not typically used for remote CLI monitoring.
netstat -i
Why it's wrong here
Shows interface statistics, not packet capture.
Common exam traps
The trap here is that candidates may confuse tools that show network statistics (like iftop or netstat) with those that perform actual packet-level capture and analysis, or assume that Wireshark is suitable for command-line-only environments without considering its GUI dependency.
Trap categories for this question
Command / output trap
Shows bandwidth usage per connection, not packet-level analysis.
Detailed technical explanation
Both tshark and tcpdump use libpcap to capture raw packets from the network interface card (NIC) in promiscuous mode, allowing them to see all traffic on the wire. tshark leverages Wireshark's extensive protocol dissectors for deep analysis, while tcpdump provides a more lightweight, filter-based capture using BPF (Berkeley Packet Filter) syntax. In real-world scenarios, tcpdump is often preferred for quick captures due to its lower overhead, whereas tshark is better for complex protocol decoding.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the LFCS 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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Operation of Running Systems — study guide chapter
Learn the concepts, then practise the questions
Operation of Running Systems practice questions
Targeted practice on this topic area only
All LFCS questions
513 questions across all exam domains
Linux Foundation Certified System Administrator LFCS study guide
Full concept coverage aligned to exam objectives
LFCS practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise LFCS questions linked to User and Group Management.
Practise LFCS questions linked to Operation of Running Systems.
Practise LFCS questions linked to Essential Commands.
Practise LFCS questions linked to Networking.
Practise LFCS questions linked to Service Configuration.
Practise LFCS questions linked to Storage Management.
Practise LFCS questions linked to LFCS fundamentals.
Practise LFCS questions linked to LFCS scenario.
Practise LFCS questions linked to LFCS troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Operation of Running Systems — This question tests Operation of Running Systems — Read the scenario before looking for a memorised answer..
The correct answer is: tshark -i eth0 — A is correct because tshark is the command-line version of Wireshark, capable of capturing and analyzing packets in real time on a specific interface using the -i flag. It provides detailed packet-level inspection, including protocol dissection, which is essential for network traffic analysis.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 25, 2026
This LFCS practice question is part of Courseiva's free Linux Foundation certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the LFCS exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.