Quick Answer
The answer is Wireshark, as it is the best tool for capturing network traffic from a SPAN port in a forensically sound manner. Wireshark excels because it can place the network interface into promiscuous mode, allowing it to capture all packets traversing the SPAN port without modifying the data, while its native pcapng file format preserves critical forensic metadata such as precise timestamps and packet integrity. On the CHFI exam, this question tests your understanding of live acquisition methods versus static analysis, often appearing as a trap where students mistakenly choose tcpdump for its command-line efficiency; however, the exam emphasizes Wireshark’s graphical interface and full-featured capture capabilities for forensic completeness. A helpful memory tip is to think of Wireshark as the “forensic Swiss Army knife” for SPAN port capture—it sees everything, changes nothing, and logs it all with a timestamp.
This CHFI practice question tests your understanding of evidence acquisition and duplication. 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.
During a network forensic investigation, you need to capture live network traffic from a switch span port. Which tool would best capture the traffic in a forensically sound manner?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Nmap
Why wrong: Nmap is a port scanner, not a packet capture tool.
Wireshark
Wireshark captures packets and can save them in standard formats.
Netcat
Why wrong: Netcat is for data transfer, not packet capture.
Tcpdump
Why wrong: Tcpdump can capture but is command-line only; Wireshark is more suitable for forensics.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Wireshark
Wireshark is the best tool for capturing live network traffic from a switch SPAN port in a forensically sound manner because it provides a robust graphical interface for real-time packet capture and analysis, supports full packet capture with timestamps, and can write captures directly to a pcapng file format that preserves packet integrity and metadata. Its ability to run in promiscuous mode ensures all traffic from the SPAN port is captured without altering the data, meeting forensic requirements for accuracy and completeness.
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
Why it's wrong here
Nmap is a port scanner, not a packet capture tool.
Wireshark
Why this is correct
Wireshark captures packets and can save them in standard formats.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Netcat
Why it's wrong here
Netcat is for data transfer, not packet capture.
Tcpdump
Why it's wrong here
Tcpdump can capture but is command-line only; Wireshark is more suitable for forensics.
Common exam traps
EC-Council often tests the misconception that Tcpdump is the only forensically sound command-line tool, but Wireshark is preferred for its GUI, advanced filtering, and pcapng support, which are critical for thorough forensic analysis and documentation.
Trap categories for this question
Command / output trap
Tcpdump can capture but is command-line only; Wireshark is more suitable for forensics.
Detailed technical explanation
Wireshark uses the libpcap/WinPcap library to capture raw packets from the network interface in promiscuous mode, which is essential for a SPAN port that mirrors all traffic from a switch. The pcapng format supports per-packet metadata like interface IDs and nanosecond timestamps, crucial for chain-of-custody and timeline reconstruction. In a real-world scenario, a forensic analyst might use Wireshark's 'Capture Options' to set a ring buffer for long-duration captures, ensuring no data loss while maintaining forensic integrity.
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 CHFI 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.
Evidence Acquisition and Duplication — study guide chapter
Learn the concepts, then practise the questions
Evidence Acquisition and Duplication practice questions
Targeted practice on this topic area only
All CHFI questions
1,000 questions across all exam domains
Computer Hacking Forensic Investigator CHFI study guide
Full concept coverage aligned to exam objectives
CHFI 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 CHFI questions linked to Computer Forensics Investigation Process.
Practise CHFI questions linked to Computer Forensics Fundamentals and Process.
Practise CHFI questions linked to Storage Forensics and File System Analysis.
Practise CHFI questions linked to Incident Response and First Responder Skills.
Practise CHFI questions linked to Computer Forensics Lab.
Practise CHFI questions linked to Evidence Acquisition and Duplication.
Practise CHFI questions linked to OS and Network Forensics.
Practise CHFI questions linked to OS and File System Forensics.
Practise CHFI questions linked to Application, Email and Cloud Forensics.
Practise CHFI questions linked to Mobile and Malware Forensics.
Practise CHFI questions linked to Network and Cloud Forensics.
Practise CHFI questions linked to Database and Application Forensics.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Evidence Acquisition and Duplication — This question tests Evidence Acquisition and Duplication — Read the scenario before looking for a memorised answer..
The correct answer is: Wireshark — Wireshark is the best tool for capturing live network traffic from a switch SPAN port in a forensically sound manner because it provides a robust graphical interface for real-time packet capture and analysis, supports full packet capture with timestamps, and can write captures directly to a pcapng file format that preserves packet integrity and metadata. Its ability to run in promiscuous mode ensures all traffic from the SPAN port is captured without altering the data, meeting forensic requirements for accuracy and completeness.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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 30, 2026
This CHFI practice question is part of Courseiva's free EC-Council 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 CHFI 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.