- A
Performing a zone transfer against the target's DNS servers
Why wrong: A zone transfer is an active interaction with the target's DNS servers and may be restricted or logged.
- B
Searching for the target's SSL certificates in Certificate Transparency logs
Certificate Transparency logs are public and can be queried without contacting the target. They often expose subdomains that may not be publicly listed elsewhere.
- C
Using Nmap to scan common ports on the target's public IP range
Why wrong: Nmap scanning is an active technique that sends packets to the target, making it detectable.
- D
Querying the target's WHOIS records for IP addresses
Why wrong: WHOIS records provide registration data but generally do not reveal internal network architecture such as subdomains or internal hostnames.
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 conducting passive reconnaissance on a target organization. Which of the following techniques would provide the MOST useful information about internal network architecture without directly interacting with the target's systems?
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
Searching for the target's SSL certificates in Certificate Transparency logs
Certificate Transparency (CT) logs are publicly accessible, append-only ledgers of SSL/TLS certificates. By searching CT logs for certificates issued to the target organization, a penetration tester can discover subdomains, hostnames, and even internal-facing server names that are included in Subject Alternative Names (SANs) or Common Names (CNs). This reveals internal network architecture details (e.g., 'mail.internal.example.com') without any direct interaction with the target's systems, making it a purely passive reconnaissance technique.
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.
- ✗
Performing a zone transfer against the target's DNS servers
Why it's wrong here
A zone transfer is an active interaction with the target's DNS servers and may be restricted or logged.
- ✓
Searching for the target's SSL certificates in Certificate Transparency logs
Why this is correct
Certificate Transparency logs are public and can be queried without contacting the target. They often expose subdomains that may not be publicly listed elsewhere.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Using Nmap to scan common ports on the target's public IP range
Why it's wrong here
Nmap scanning is an active technique that sends packets to the target, making it detectable.
- ✗
Querying the target's WHOIS records for IP addresses
Why it's wrong here
WHOIS records provide registration data but generally do not reveal internal network architecture such as subdomains or internal hostnames.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse passive reconnaissance with low-interaction techniques like WHOIS lookups or zone transfers, not realizing that zone transfers and Nmap scans are active techniques that directly interact with the target's systems, while Certificate Transparency logs are a purely passive, third-party data source.
Detailed technical explanation
How to think about this question
Certificate Transparency logs are governed by RFC 6962 and are designed to prevent fraudulent certificates. Tools like crt.sh or censys.io allow querying these logs via APIs; a search for '%.example.com' can reveal all certificates issued for subdomains, including those for internal services (e.g., 'vpn.internal.example.com', 'gitlab.corp.example.com'). In a real-world scenario, a tester might find a certificate for 'admin.office365.example.com' that exposes an internal administrative portal, bypassing the need for active scanning.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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: Searching for the target's SSL certificates in Certificate Transparency logs — Certificate Transparency (CT) logs are publicly accessible, append-only ledgers of SSL/TLS certificates. By searching CT logs for certificates issued to the target organization, a penetration tester can discover subdomains, hostnames, and even internal-facing server names that are included in Subject Alternative Names (SANs) or Common Names (CNs). This reveals internal network architecture details (e.g., 'mail.internal.example.com') without any direct interaction with the target's systems, making it a purely passive reconnaissance technique.
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: Jun 11, 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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