The correct choice is to query the target’s TLS certificate transparency logs for subdomains. Certificate Transparency (CT) logs are publicly accessible, append-only records of every SSL/TLS certificate issued by a Certificate Authority, and they often contain the full list of subdomains associated with a domain—including those for internal services like Confluence that were inadvertently exposed via a public certificate. This passive reconnaissance technique allows a tester to discover externally accessible references without any active interaction with the target’s systems, making it ideal for stealthy information gathering. On the CompTIA PenTest+ PT0-002 exam, this question tests your ability to distinguish passive from active techniques; a common trap is choosing active scanning or DNS brute-forcing, which generate network traffic. Remember the memory tip: “CT logs spill the subdomain list—no queries, no risk.”
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 information gathering on a target company. The company has an internal Confluence wiki that is only accessible from within the corporate network. The tester wants to discover any externally accessible references to the wiki without actively interacting with the target's systems. Which of the following techniques would be MOST effective?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Query the target's TLS certificate transparency logs for subdomains
Querying TLS certificate transparency logs is the most effective technique because it allows the tester to discover subdomains associated with the target's domain without any active interaction. Certificate Transparency (CT) logs are publicly accessible records of all SSL/TLS certificates issued by Certificate Authorities (CAs), and they often include subdomains that may point to internal services like Confluence if they were ever exposed via a public certificate. This passive reconnaissance method reveals externally accessible references that the target may have inadvertently made public.
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.
✓
Query the target's TLS certificate transparency logs for subdomains
Why this is correct
Certificate transparency logs list subdomains with SSL certs, which may include internal services.
Related concept
Read the scenario before looking for a memorised answer.
✗
Search for exposed Confluence login pages on Shodan
Why it's wrong here
Internal systems are rarely exposed on Shodan, so this is ineffective.
✗
Use the Wayback Machine to find historical public references
Why it's wrong here
The internal wiki was never public, so historical references are unlikely.
✗
Perform a zone transfer on the target's DNS servers
Why it's wrong here
Zone transfers are active and typically disabled on DNS servers.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think Shodan is a passive reconnaissance tool, but querying Shodan for specific services like Confluence login pages still involves active probing of the target's IP addresses, which counts as active interaction in the context of this question.
Detailed technical explanation
How to think about this question
Certificate Transparency logs are governed by RFC 6962 and are maintained by multiple log operators (e.g., Google, Cloudflare, DigiCert). Tools like `crt.sh` or `certspotter` query these logs via APIs to retrieve all certificates issued for a domain, including wildcard and subdomain entries. In real-world scenarios, organizations often issue certificates for internal services (e.g., wiki.example.com) to enable HTTPS, inadvertently exposing subdomains in CT logs even if the service is only reachable internally.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PT0-002 question in full detail.
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: Query the target's TLS certificate transparency logs for subdomains — Querying TLS certificate transparency logs is the most effective technique because it allows the tester to discover subdomains associated with the target's domain without any active interaction. Certificate Transparency (CT) logs are publicly accessible records of all SSL/TLS certificates issued by Certificate Authorities (CAs), and they often include subdomains that may point to internal services like Confluence if they were ever exposed via a public certificate. This passive reconnaissance method reveals externally accessible references that the target may have inadvertently made public.
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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Question Discussion
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