The answer is to associate the attacker's MAC address with the IP address of a legitimate host. This is the core purpose of ARP spoofing in MITM attacks because the Address Resolution Protocol maps IP addresses to MAC addresses on a local network; by sending forged ARP replies, the attacker tricks the target device into updating its ARP cache so that traffic destined for the legitimate host—such as the default gateway—is instead sent to the attacker’s machine. On the CompTIA PenTest+ PT0-002 exam, this concept tests your understanding of network-based exploitation and traffic interception, often appearing in questions about active reconnaissance or post-exploitation pivoting. A common trap is confusing ARP spoofing with DNS spoofing or thinking its purpose is to flood the network; remember that ARP spoofing is about redirecting traffic at Layer 2, not breaking connectivity. A helpful memory tip: “ARP spoofing swaps the MAC, not the IP—so the traffic comes to you.”
PT0-002 Attacks and Exploits Practice Question
This PT0-002 practice question tests your understanding of attacks and exploits. 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 penetration tester is performing a man-in-the-middle attack on a network using ARP spoofing. What is the primary purpose of ARP spoofing?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
To associate the attacker's MAC address with the IP address of a legitimate host
ARP spoofing works by sending forged ARP replies to associate the attacker's MAC address with the IP address of a legitimate host (e.g., the default gateway). This causes traffic destined for that IP to be sent to the attacker instead, enabling interception and manipulation of network communications.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
To assign a fake IP address to the attacker's device
To associate the attacker's MAC address with the IP address of a legitimate host
Why this is correct
This redirects traffic destined for that IP to the attacker.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
To modify the routing table of the target
Why it's wrong here
ARP spoofing does not alter routing tables; it manipulates ARP caches.
✗
To poison the DNS cache of the target
Why it's wrong here
DNS cache poisoning is different; ARP spoofing operates at layer 2.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse ARP spoofing with IP address spoofing or DNS poisoning, but the exam specifically tests that ARP spoofing manipulates MAC-to-IP mappings at Layer 2, not IP addresses or higher-layer caches.
Detailed technical explanation
How to think about this question
Under the hood, ARP spoofing exploits the stateless nature of ARP: hosts accept unsolicited ARP replies (gratuitous ARP) without verification. Tools like arpspoof or Ettercap send continuous forged ARP packets to both the victim and the gateway, creating a man-in-the-middle position. A subtle behavior is that modern operating systems may use ARP security features (e.g., Dynamic ARP Inspection on Cisco switches) to validate ARP packets against the DHCP snooping binding table, which can detect and block spoofing attempts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PT0-002 question in full detail.
Attacks and Exploits — This question tests Attacks and Exploits — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: To associate the attacker's MAC address with the IP address of a legitimate host — ARP spoofing works by sending forged ARP replies to associate the attacker's MAC address with the IP address of a legitimate host (e.g., the default gateway). This causes traffic destined for that IP to be sent to the attacker instead, enabling interception and manipulation of network communications.
What should I do if I get this PT0-002 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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