Name two common port-scanning tools and a basic difference between them.

• A. Masscan and Nmap; Masscan emphasizes speed for large networks.
• B. Nmap and Masscan; Nmap emphasizes accuracy and service/version detection, Masscan emphasizes speed for large networks.
• C. Nessus and Metasploit
• D. Hydra and Aircrack

Answer: (B)

Two common port-scanning tools you should know are Nmap and Masscan. Nmap is designed for thorough, accurate discovery: it probes ports and can identify what services are running, what versions, and even fingerprint the operating system, often with detailed output and scripting capabilities. Masscan is built for speed, able to scan enormous address spaces quickly, which makes it ideal for broad network sweeps, though it offers less built-in depth for service/version detection. The key distinction is that Nmap emphasizes accuracy and service/version discovery, while Masscan emphasizes speed for large networks. Other tools listed are not primarily port scanners—Nessus and Metasploit are vulnerability assessment and exploitation frameworks, and Hydra and Aircrack focus on password cracking and wireless security—so they don’t fit as the two standard port-scanning tools in this context.