This CEH practice question tests your understanding of footprinting and reconnaissance. 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.
Which TWO of the following tools are commonly used for passive reconnaissance?
theHarvester
theHarvester gathers information from public sources passively.
nmap
Why wrong: Nmap sends packets to hosts, making it active.
Netcat
Why wrong: Netcat is used for active network connections.
Metasploit
Why wrong: Metasploit is an active exploitation framework.
Shodan
Shodan indexes publicly available device data passively.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
theHarvester
theHarvester is a passive reconnaissance tool that gathers information from public sources such as search engines (Google, Bing), PGP key servers, and the Shodan API without directly interacting with the target network. It collects email addresses, subdomains, IPs, and employee names by querying publicly available data, making it a purely passive technique.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
theHarvester
Why this is correct
theHarvester gathers information from public sources passively.
Related concept
Read the scenario before looking for a memorised answer.
nmap
Why it's wrong here
Nmap sends packets to hosts, making it active.
Netcat
Why it's wrong here
Netcat is used for active network connections.
Metasploit
Why it's wrong here
Metasploit is an active exploitation framework.
Shodan
Why this is correct
Shodan indexes publicly available device data passively.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
EC-Council often tests the distinction that tools like nmap and Netcat are active because they send packets to the target, while theHarvester and Shodan (when querying its database) rely on third-party collected data, making them passive.
Detailed technical explanation
Passive reconnaissance relies on OSINT (Open Source Intelligence) sources like DNS records, WHOIS databases, and search engine caches. theHarvester uses the Google Custom Search API and Bing API to scrape indexed data without sending any packets to the target's infrastructure. Shodan, while often used passively for querying its pre-collected database of banners, can also be used actively if you perform live scans via its API; however, in the CEH context, querying Shodan's existing database is considered passive because you are not touching the target's network.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the CEH exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Footprinting and Reconnaissance — This question tests Footprinting and Reconnaissance — Read the scenario before looking for a memorised answer..
The correct answer is: theHarvester — theHarvester is a passive reconnaissance tool that gathers information from public sources such as search engines (Google, Bing), PGP key servers, and the Shodan API without directly interacting with the target network. It collects email addresses, subdomains, IPs, and employee names by querying publicly available data, making it a purely passive technique.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This CEH practice question is part of Courseiva's free EC-Council 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 CEH exam.
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