The answer is banner information and service metadata from internet-connected devices. While a simple port scan only reveals whether a port is open or closed, Shodan goes far beyond by actively probing each discovered service and capturing the banner it returns—this includes HTTP server headers, SSH version strings, FTP welcome messages, and even default credentials or application fingerprints. On the Certified Ethical Hacker CEH exam, this distinction tests your understanding of reconnaissance depth: the trap is choosing an answer that only mentions “open ports” or “IP addresses,” which misses Shodan’s core value of collecting service-level metadata. To remember this, think of Shodan as a “banner grabber at scale”—it doesn’t just knock on doors; it reads the nameplates and notes what each service says about itself.
CEH Footprinting, Reconnaissance and Scanning Practice Question
This CEH practice question tests your understanding of footprinting, reconnaissance and scanning. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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.
During a reconnaissance phase, a penetration tester uses Shodan to search for devices with a specific open port. Which of the following BEST describes what Shodan provides beyond a simple port scan?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Banner information and service metadata from internet-connected devices
Shodan is a search engine for internet-connected devices that actively probes IP addresses and collects banner information—the metadata that services (e.g., HTTP, SSH, FTP) return upon connection. This includes server headers, version strings, default credentials, and other service fingerprints, which goes far beyond a simple port scan that only reports whether a port is open or closed.
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.
✗
Real-time network traffic analysis
Why it's wrong here
Shodan does not perform real-time traffic analysis; it relies on periodic scans.
✗
Passive DNS records and domain registration details
Why it's wrong here
Passive DNS and domain registration are provided by tools like WHOIS and SecurityTrails, not Shodan.
✓
Banner information and service metadata from internet-connected devices
Why this is correct
Shodan's main feature is gathering banner information and metadata from scanned services.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Historical vulnerability data for each device
Why it's wrong here
Shodan does not maintain historical vulnerability data; it provides current service banners.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Shodan's banner-grabbing capability with a vulnerability scanner, assuming it provides historical CVE data, when in fact Shodan only shows the current service fingerprint and does not automatically map it to vulnerabilities.
Detailed technical explanation
How to think about this question
Shodan works by sending specially crafted probes (e.g., HTTP GET, SSH banner grab, FTP greeting) to every IPv4 address and parsing the response banners using a custom fingerprinting engine. The service metadata it collects—such as the exact 'Server' header in HTTP responses or the SSH version string—can reveal unpatched software, default configurations, or even embedded device models, enabling attackers to target specific CVEs without needing a live vulnerability scan.
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 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CEH question in full detail.
Footprinting, Reconnaissance and Scanning — This question tests Footprinting, Reconnaissance and Scanning — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Banner information and service metadata from internet-connected devices — Shodan is a search engine for internet-connected devices that actively probes IP addresses and collects banner information—the metadata that services (e.g., HTTP, SSH, FTP) return upon connection. This includes server headers, version strings, default credentials, and other service fingerprints, which goes far beyond a simple port scan that only reports whether a port is open or closed.
What should I do if I get this CEH question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which THREE of the following are legitimate uses of the Shodan search engine in a security assessment? (Select 3)
hard
A.Performing SQL injection on a web application
✓ B.Discovering internet-connected industrial control systems (ICS) with default passwords
✓ C.Mapping all SSL/TLS certificates for a domain to find subdomains
D.Sending phishing emails to employees of a target organization
✓ E.Identifying open ports and services on all hosts in a given IP range
Why B: Shodan is a search engine for internet-connected devices. It indexes banners from services like HTTP, SSH, and FTP, allowing security assessors to identify exposed industrial control systems (ICS) such as SCADA devices. Discovering ICS with default passwords is a legitimate reconnaissance use because it helps assess the security posture of critical infrastructure without active exploitation.
Last reviewed: Jun 24, 2026
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