- A
WPScan
Why wrong: WPScan is a WordPress vulnerability scanner, not a passive subdomain enumeration tool.
- B
Nmap
Why wrong: Nmap is an active reconnaissance tool used for port scanning and host discovery, not passive subdomain enumeration.
- C
theHarvester
theHarvester collects emails, subdomains, and other data from public sources, suitable for passive reconnaissance.
- D
Gobuster
Why wrong: Gobuster is used for active brute-forcing of directories and subdomains, not passive reconnaissance.
Question 874 of 1,000
PT0-002 Practice Question: Information Gathering and Vulnerability Scanning
This PT0-002 practice question tests your understanding of information gathering and vulnerability scanning. 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 passive reconnaissance and wants to identify subdomains associated with a target domain without directly querying the target's DNS servers. Which tool is specifically designed for this purpose?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
theHarvester
TheHarvester is specifically designed for passive reconnaissance, gathering subdomains from public sources like search engines (Google, Bing), PGP key servers, and the Shodan database without querying the target's DNS servers directly. This aligns with the requirement to avoid direct interaction with the target's infrastructure, making it the correct choice for passive subdomain enumeration.
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.
- ✗
WPScan
Why it's wrong here
WPScan is a WordPress vulnerability scanner, not a passive subdomain enumeration tool.
- ✗
Nmap
Why it's wrong here
Nmap is an active reconnaissance tool used for port scanning and host discovery, not passive subdomain enumeration.
- ✓
theHarvester
Why this is correct
theHarvester collects emails, subdomains, and other data from public sources, suitable for passive reconnaissance.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Gobuster
Why it's wrong here
Gobuster is used for active brute-forcing of directories and subdomains, not passive reconnaissance.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse passive reconnaissance with tools that can perform subdomain enumeration but require active DNS queries, such as Gobuster or Nmap's dns-brute script, leading them to overlook theHarvester's passive data collection from public sources.
Detailed technical explanation
How to think about this question
TheHarvester leverages APIs and web scraping to collect subdomain data from sources like Google dorking (e.g., site:example.com), Bing, and the Certificate Transparency log (crt.sh), which is a passive method because it queries third-party services rather than the target's DNS. In real-world scenarios, this approach avoids detection by the target's security monitoring systems, such as DNS logging or intrusion detection systems, which would flag direct DNS queries. The tool's output can include email addresses and virtual hosts, but its primary passive subdomain feature relies on public data aggregation.
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 developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this PT0-002 question test?
Information Gathering and Vulnerability Scanning — This question tests Information Gathering and Vulnerability Scanning — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: theHarvester — TheHarvester is specifically designed for passive reconnaissance, gathering subdomains from public sources like search engines (Google, Bing), PGP key servers, and the Shodan database without querying the target's DNS servers directly. This aligns with the requirement to avoid direct interaction with the target's infrastructure, making it the correct choice for passive subdomain enumeration.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This PT0-002 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 PT0-002 exam.
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