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. A key principle to apply: search engine 'site:' operator queries indexed content.. 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 technique can be used to discover subdomains of the target's domain without sending any packets to the target's network?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Using the 'site:' operator in a search engine query
Option B is correct because using the 'site:' operator in a search engine query (e.g., 'site:example.com') retrieves indexed subdomains from the search engine's cache without sending any packets to the target's network. This is a purely passive technique that leverages publicly available data, aligning with the definition of passive reconnaissance.
Sending ICMP echo requests to potential subdomain IP addresses
Why it's wrong here
ICMP requests are active and may be detected by intrusion detection systems.
✗
Querying WHOIS databases for domain registration information
Why it's wrong here
WHOIS provides registration info, not subdomains.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse passive reconnaissance with techniques that appear passive but still send packets (like DNS brute-force or ICMP echo requests), or they incorrectly assume WHOIS queries can enumerate subdomains when WHOIS only provides registration metadata.
Detailed technical explanation
How to think about this question
Search engines like Google maintain a massive index of web pages, including subdomains, via their crawlers. The 'site:' operator filters results to a specific domain, revealing subdomains that have been crawled and cached. This technique is passive because it relies on the search engine's existing data, not on direct interaction with the target's servers, and can uncover subdomains like 'mail.example.com' or 'dev.example.com' that are publicly accessible but not linked from the main site.
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. Search engine 'site:' operator queries indexed content. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
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 — Search engine 'site:' operator queries indexed content..
What is the correct answer to this question?
The correct answer is: Using the 'site:' operator in a search engine query — Option B is correct because using the 'site:' operator in a search engine query (e.g., 'site:example.com') retrieves indexed subdomains from the search engine's cache without sending any packets to the target's network. This is a purely passive technique that leverages publicly available data, aligning with the definition of passive reconnaissance.
What should I do if I get this PT0-002 question wrong?
Review search engine 'site:' operator queries indexed content., then practise related PT0-002 questions on the same topic to reinforce the concept.
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Question Discussion
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