18+ practice questions focused on Footprinting and Reconnaissance — one of the most tested topics on the Certified Ethical Hacker CEH exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start Footprinting and Reconnaissance PracticeA penetration tester is performing a footprinting exercise on a target company. The tester wants to identify the network range and ISP of the target. Which of the following tools or techniques is MOST appropriate for this purpose?
Explanation: A WHOIS lookup is a fundamental technique for gathering registration information about Internet resources. While a direct WHOIS lookup on a domain provides details about the domain registrant and registrar, it often also reveals the hosting provider or name servers, which are crucial for identifying the target's ISP. To obtain the precise network range (e.g., CIDR block) and the organization (ISP) responsible for the IP addresses used by the target, a penetration tester would typically first resolve the domain to an IP address and then conduct a WHOIS lookup on that IP address. This overall process, initiated by querying the domain, leverages WHOIS to gather the required authoritative registration data.
During footprinting, a tester finds that the target's DNS server allows recursive queries from the internet. What is the MOST significant security implication of this finding?
Explanation: A DNS server that allows recursive queries from the internet can be exploited in a DNS amplification attack, a type of denial-of-service (DoS) attack. The attacker sends a small query with a spoofed source IP (the victim's IP) to the open recursive resolver, which responds with a much larger response (e.g., using the ANY record type), amplifying traffic up to 50-100 times. This floods the victim's network, making the DNS server an unwitting participant in the attack.
During a penetration test, you are tasked with performing footprinting on a target organization. You have identified the target's IP range 192.168.1.0/24. Which of the following techniques would provide the most comprehensive information about the target's network topology and potential entry points?
Explanation: The explanation correctly describes what traceroute does (revealing Layer 3 path and hops), but it fails to address the fundamental issue of tracerouting to a private IP range from an external perspective. Therefore, while traceroute is conceptually the best technique for mapping network topology among the options, it's not applicable in the scenario as described.
Which TWO of the following tools are commonly used for passive reconnaissance?
Explanation: 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. Shodan is also considered a passive reconnaissance tool because it acts as a search engine for Internet-connected devices. When an attacker queries Shodan, they are accessing information that Shodan has already collected through its own active scanning, rather than directly sending packets to the target system. This indirect method of information gathering makes it passive from the attacker's perspective regarding the target.
During the reconnaissance phase, a tester discovers that the target company's email server is configured to automatically respond to delivery status notifications (DSNs). Which type of attack could this information facilitate?
Explanation: Email servers that automatically respond to Delivery Status Notifications (DSNs) as defined in RFC 1891/3464 can be exploited for email enumeration. By sending a message to a non-existent address, the DSN response will indicate the address is invalid, while a valid address may generate no DSN or a different response. This allows an attacker to systematically verify valid email addresses on the target domain without triggering a full bounce-back to the original sender.
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Practice all Footprinting and Reconnaissance questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of Footprinting and Reconnaissance. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
Footprinting and Reconnaissance questions on the CEH frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. Footprinting and Reconnaissance is tested as part of the Certified Ethical Hacker CEH blueprint. Practicing with targeted Footprinting and Reconnaissance questions ensures you can handle any format or difficulty that appears.
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