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 wants to identify the operating system of a remote host without sending any traffic to the target network. Which of the following techniques is most effective for this purpose?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Shodan to search for the host's IP address and examine the service banners.
Option B is correct because Shodan is a search engine that indexes service banners and metadata from internet-connected devices. By querying Shodan for the target's IP address, the tester can retrieve previously collected OS information without sending any packets to the target, satisfying the 'no traffic' constraint.
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.
✗
Perform an nmap OS fingerprint scan on the host.
Why it's wrong here
Nmap sends packets to the target, which is active reconnaissance, not passive.
✓
Use Shodan to search for the host's IP address and examine the service banners.
Why this is correct
Shodan provides information gathered from previous scans, allowing for passive OS identification.
Related concept
Read the scenario before looking for a memorised answer.
✗
Send a ping sweep to the host's network segment.
Why it's wrong here
Ping sweeps generate network traffic to determine live hosts, not OS details.
✗
Use ARP scanning to discover the host's MAC address and look up the vendor.
Why it's wrong here
ARP scanning is active and provides only MAC vendor information, not the OS.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume passive OS identification requires active scanning tools like nmap, overlooking that Shodan provides a passive, historical data source that avoids generating any traffic to the target.
Detailed technical explanation
How to think about this question
Shodan works by continuously scanning the internet and storing banners from services like HTTP, SSH, and FTP. These banners often include OS version strings (e.g., 'Apache/2.4.41 (Ubuntu)') or are fingerprinted by Shodan's own heuristics. A tester can use the Shodan API or web interface to retrieve this data passively, relying on Shodan's last scan timestamp, which may be hours or days old.
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 team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
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: Use Shodan to search for the host's IP address and examine the service banners. — Option B is correct because Shodan is a search engine that indexes service banners and metadata from internet-connected devices. By querying Shodan for the target's IP address, the tester can retrieve previously collected OS information without sending any packets to the target, satisfying the 'no traffic' constraint.
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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