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 of the following tools are used to capture and analyze network packets on a Linux system?
tcpdump
tcpdump is a command-line packet capture tool.
wireshark (tshark)
Wireshark and its CLI version tshark capture and analyze packets.
iptables
Why wrong: iptables is a firewall, not a capture tool.
netstat
Why wrong: netstat displays network connections and statistics, not packet capture.
nmap
Why wrong: nmap is a network scanner, not a packet capture tool.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
tcpdump
tcpdump is a command-line packet analyzer that captures raw network packets from the wire by placing the network interface into promiscuous mode and using libpcap to read packets. It allows filtering based on protocols, ports, and hosts using BPF (Berkeley Packet Filter) syntax, making it a fundamental tool for network troubleshooting and security 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.
tcpdump
Why this is correct
tcpdump is a command-line packet capture tool.
Related concept
Read the scenario before looking for a memorised answer.
wireshark (tshark)
Why this is correct
Wireshark and its CLI version tshark capture and analyze packets.
Related concept
Read the scenario before looking for a memorised answer.
iptables
Why it's wrong here
iptables is a firewall, not a capture tool.
netstat
Why it's wrong here
netstat displays network connections and statistics, not packet capture.
nmap
Why it's wrong here
nmap is a network scanner, not a packet capture tool.
Common exam traps
The trap here is that candidates often confuse tools that manipulate packets (like iptables) or scan networks (like nmap) with tools that passively capture and decode packet contents, leading them to select iptables or nmap instead of recognizing that only tcpdump and tshark perform raw packet capture and analysis.
Detailed technical explanation
Both tcpdump and tshark (the command-line version of Wireshark) rely on libpcap to capture packets at the data link layer, allowing them to see raw frames including Ethernet headers. A subtle behavior is that tcpdump by default only captures the first 68 bytes of a packet (snap length), which can truncate payloads; using the '-s 0' flag captures the entire packet. In real-world scenarios, combining tcpdump with Wireshark (via remote capture or by saving a pcap file) is common for deep protocol analysis, such as debugging TCP retransmissions or TLS handshake failures.
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 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
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FAQ
Advanced Networking Configuration — This question tests Advanced Networking Configuration — Read the scenario before looking for a memorised answer..
The correct answer is: tcpdump — tcpdump is a command-line packet analyzer that captures raw network packets from the wire by placing the network interface into promiscuous mode and using libpcap to read packets. It allows filtering based on protocols, ports, and hosts using BPF (Berkeley Packet Filter) syntax, making it a fundamental tool for network troubleshooting and security 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.
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Last reviewed: Jun 25, 2026
This LPIC-2 practice question is part of Courseiva's free LPI 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 LPIC-2 exam.
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