- A
amass
Correct. Amass performs subdomain enumeration using various techniques.
- B
subfinder
Correct. Subfinder is a passive subdomain discovery tool.
- C
dnsx
Correct. dnsx is a DNS toolkit for subdomain enumeration.
- D
sublist3r
Why wrong: Sublist3r is also a subdomain tool, but it's not one of the three listed as 'commonly used' in the context of the question. The question expects dnsx, amass, subfinder.
- E
gobuster dns
Why wrong: Gobuster has a DNS mode, but it's less specialized than the others.
Question 851 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 tasked with performing a DNS enumeration of a target domain to discover subdomains. Which THREE tools are commonly used for subdomain bruteforcing? (Select THREE.)
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
✓
amass
Amass is correct because it is a dedicated subdomain enumeration tool that performs bruteforcing via DNS queries, using wordlists and recursive resolution to discover subdomains. It integrates with multiple data sources and supports active bruteforcing techniques against target domains.
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.
- ✓
amass
Why this is correct
Correct. Amass performs subdomain enumeration using various techniques.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
subfinder
Why this is correct
Correct. Subfinder is a passive subdomain discovery tool.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
dnsx
Why this is correct
Correct. dnsx is a DNS toolkit for subdomain enumeration.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
sublist3r
Why it's wrong here
Sublist3r is also a subdomain tool, but it's not one of the three listed as 'commonly used' in the context of the question. The question expects dnsx, amass, subfinder.
- ✗
gobuster dns
Why it's wrong here
Gobuster has a DNS mode, but it's less specialized than the others.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse passive enumeration tools like sublist3r with active bruteforcing tools, or misidentify the correct tool name format (e.g., 'gobuster dns' vs. 'gobuster' with the dns subcommand).
Detailed technical explanation
How to think about this question
DNS subdomain bruteforcing works by sending A, AAAA, or CNAME queries for each word in a wordlist against the target domain, analyzing NXDOMAIN vs. NOERROR responses to identify valid subdomains. Tools like amass and subfinder use concurrent queries and rate limiting to avoid detection, while dnsx can validate results by resolving discovered subdomains to ensure they are live.
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.
Visual reference
What to study next
Got this wrong? Here's your next step.
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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: amass — Amass is correct because it is a dedicated subdomain enumeration tool that performs bruteforcing via DNS queries, using wordlists and recursive resolution to discover subdomains. It integrates with multiple data sources and supports active bruteforcing techniques against target domains.
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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