Which option instructs Nmap version detection to consider all ports during detection?

Which option instructs Nmap version detection to consider all ports during detection?

• A. -F
• B. -p-
• C. -sV --allports
• D. -O

Answer: (C)

Version detection is triggered with -sV. To have Nmap probe every port for version information, add the all-ports flag to the version-detection run: -sV --allports. This combination makes Nmap check all 65535 ports for services and attempt to identify their versions, giving a complete view across the entire port range rather than just the most common ports. It also means more time and traffic, and some networks may react differently to such thorough probing. The other options either change the port set or focus on other features (like OS detection) and don’t extend version probing to every port.

Version detection is triggered with -sV. To have Nmap probe every port for version information, add the all-ports flag to the version-detection run: -sV --allports. This combination makes Nmap check all 65535 ports for services and attempt to identify their versions, giving a complete view across the entire port range rather than just the most common ports. It also means more time and traffic, and some networks may react differently to such thorough probing. The other options either change the port set or focus on other features (like OS detection) and don’t extend version probing to every port.