CEH Footprinting, Reconnaissance and Scanning Practice Question
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?
⚠ Common exam trap
Many 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.
Answer choices
Why each option matters
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.
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 network traffic analysis; instead, it relies on periodic active scans of internet-connected devices. It captures static snapshots of service banners and metadata at specific points in time, rather than continuously monitoring dynamic packet flows or network conversations. Tools like network sniffers (e.g., Wireshark) or intrusion detection systems (e.g., Snort) are designed for real-time traffic inspection and analysis.
- ✗
Passive DNS records and domain registration details
Why it's wrong here
Passive DNS records and domain registration details are not a primary feature of Shodan. Information such as domain ownership, registrar details, and historical DNS resolution records are typically gathered using dedicated WHOIS lookup services or specialized passive DNS databases like those offered by SecurityTrails or Farsight DNSDB. Shodan focuses on identifying and cataloging services running on specific IP addresses and ports, not on domain-centric intelligence.
- ✓
Banner information and service metadata from internet-connected devices
Why this is correct
Shodan's core functionality involves actively scanning the internet to identify open ports and then performing banner grabbing to collect detailed information from exposed services. This includes service banners (e.g., HTTP server versions, SSH daemon versions), operating system details, geographic location, and other configuration metadata. This rich metadata allows penetration testers to quickly identify potential vulnerabilities, misconfigurations, and the specific technologies running on internet-facing assets, forming a critical part of the reconnaissance phase.
- ✗
Historical vulnerability data for each device
Why it's wrong here
Shodan provides current service banners and metadata, which might indicate the presence of a vulnerable software version, but it does not maintain historical vulnerability data for individual devices. It offers a snapshot of the current state rather than a comprehensive historical record of patches, exploits, or past security incidents. Tracking historical vulnerability data, patch levels, and configuration changes over time is typically handled by dedicated vulnerability management platforms or continuous vulnerability assessment tools.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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