This CS0-003 practice question tests your understanding of security operations. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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 analyst wants to capture all traffic to and from a specific IP address for analysis. Which command-line tool is most appropriate?
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.
nmap -sS 10.0.0.1
Why wrong: Nmap initiates connections, not passive capture.
netstat -ant | grep 10.0.0.1
Why wrong: Shows only established connections.
iptables -L -v
Why wrong: Lists firewall rules, not captures traffic.
tcpdump host 10.0.0.1
Captures all packets to/from that host.
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 host 10.0.0.1
Option D is correct because `tcpdump host 10.0.0.1` captures all packets where the source or destination IP address matches 10.0.0.1, making it the ideal tool for capturing all traffic to and from a specific IP for analysis. It operates at the packet level, using libpcap to intercept raw network frames, and the `host` filter instructs it to match both directions of traffic without additional parsing or state tracking.
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.
nmap -sS 10.0.0.1
Why it's wrong here
Nmap initiates connections, not passive capture.
netstat -ant | grep 10.0.0.1
Why it's wrong here
Shows only established connections.
iptables -L -v
Why it's wrong here
Lists firewall rules, not captures traffic.
tcpdump host 10.0.0.1
Why this is correct
Captures all packets to/from that host.
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.
Common exam traps
The trap here is that candidates confuse tools that probe or display state (nmap, netstat, iptables) with tools that capture raw traffic (tcpdump), leading them to select a tool that does not actually capture packets for analysis.
Trap categories for this question
Command / output trap
Shows only established connections.
Detailed technical explanation
`tcpdump` uses the Berkeley Packet Filter (BPF) syntax to compile a filter expression into kernel-level bytecode, which is then executed by the packet capture mechanism to minimize overhead. The `host` filter is a BPF primitive that matches packets where either the source or destination IP equals the specified address, equivalent to `(src host 10.0.0.1) or (dst host 10.0.0.1)`. In real-world scenarios, analysts often combine this with `-w` to write to a pcap file for later analysis in Wireshark, or add `-i eth0` to specify a particular interface.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Security Operations — This question tests Security Operations — Read the scenario before looking for a memorised answer..
The correct answer is: tcpdump host 10.0.0.1 — Option D is correct because `tcpdump host 10.0.0.1` captures all packets where the source or destination IP address matches 10.0.0.1, making it the ideal tool for capturing all traffic to and from a specific IP for analysis. It operates at the packet level, using libpcap to intercept raw network frames, and the `host` filter instructs it to match both directions of traffic without additional parsing or state tracking.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This CS0-003 practice question is part of Courseiva's free CompTIA 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 CS0-003 exam.
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