Quick Answer
The correct answer is man-in-the-middle (MITM) attack. This technique is defined by an attacker secretly intercepting and potentially modifying communications between two parties who believe they are directly connected, often by inserting themselves into the data path through methods like ARP spoofing, DNS spoofing, or a rogue access point. On the CompTIA Network+ N10-009 exam, this concept tests your understanding of network security threats and how attackers exploit trust in communication channels; a common trap is confusing MITM with a denial-of-service attack, but remember that MITM involves active interception and alteration, not just disruption. A helpful memory tip is to visualize the attacker as a "hidden middleman" in a conversation—if the two parties never verify each other's identity, the attacker can silently read and rewrite every message.
This N10-009 practice question tests your understanding of network security. 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.
Which attack technique involves an attacker intercepting and potentially modifying the communication between two parties without their knowledge?
Man-in-the-middle
This attack allows the attacker to intercept and alter communications between two parties.
Replay attack
Why wrong: A replay attack involves capturing and retransmitting valid data, not real-time interception.
Smurf attack
Why wrong: A Smurf attack is a DDoS that uses ICMP echo requests to a broadcast address, not interception.
Phishing
Why wrong: Phishing is a social engineering attack, not a network-level interception.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Man-in-the-middle
A man-in-the-middle (MITM) attack is correct because it specifically involves an attacker secretly intercepting and potentially altering communications between two parties who believe they are directly communicating with each other. This is achieved by the attacker inserting themselves into the communication path, often by ARP spoofing, DNS spoofing, or rogue access points, allowing them to capture, decrypt, or modify packets in transit.
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.
Man-in-the-middle
Why this is correct
This attack allows the attacker to intercept and alter communications between two parties.
Related concept
Read the scenario before looking for a memorised answer.
Replay attack
Why it's wrong here
A replay attack involves capturing and retransmitting valid data, not real-time interception.
Smurf attack
Why it's wrong here
A Smurf attack is a DDoS that uses ICMP echo requests to a broadcast address, not interception.
Phishing
Why it's wrong here
Phishing is a social engineering attack, not a network-level interception.
Common exam traps
The trap here is that candidates often confuse a replay attack with a MITM attack because both involve capturing traffic, but a replay attack only retransmits captured data without real-time interception or modification of the ongoing session.
Detailed technical explanation
In a MITM attack using ARP spoofing, the attacker sends forged ARP replies to map their MAC address to the IP address of the default gateway, causing the victim's traffic to be routed through the attacker's machine. Tools like Ettercap or Bettercap can then perform packet capture and injection, enabling the attacker to modify HTTP responses or downgrade TLS connections. A subtle behavior is that modern protocols like HTTPS with HSTS or certificate pinning can mitigate this, but a MITM can still succeed if the attacker installs a rogue CA certificate on the victim's device.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Network Security — study guide chapter
Learn the concepts, then practise the questions
Network Security practice questions
Targeted practice on this topic area only
All N10-009 questions
520 questions across all exam domains
CompTIA Network+ N10-009 study guide
Full concept coverage aligned to exam objectives
N10-009 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 N10-009 questions linked to Networking Concepts.
Practise N10-009 questions linked to Network Implementation.
Practise N10-009 questions linked to Network Operations.
Practise N10-009 questions linked to Network Security.
Practise N10-009 questions linked to Network Troubleshooting.
Practise N10-009 questions linked to Network+ network fundamentals.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Network Security — This question tests Network Security — Read the scenario before looking for a memorised answer..
The correct answer is: Man-in-the-middle — A man-in-the-middle (MITM) attack is correct because it specifically involves an attacker secretly intercepting and potentially altering communications between two parties who believe they are directly communicating with each other. This is achieved by the attacker inserting themselves into the communication path, often by ARP spoofing, DNS spoofing, or rogue access points, allowing them to capture, decrypt, or modify packets in transit.
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 →
Keep practising
Last reviewed: Jun 11, 2026
This N10-009 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 N10-009 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.