Which command demonstrates inspecting versions only on port 80 and 443?

Which command demonstrates inspecting versions only on port 80 and 443?

• A. nmap -sV -p 22,80 target
• B. nmap -sV -p 80,443 target
• C. nmap -sV -p 80-443 target
• D. nmap -sV -p 22-80 target

Answer: (B)

To check service versions on specific ports, combine version detection with a precise port list. The -sV option tells Nmap to probe services to determine their versions. To limit this to only ports 80 and 443, you specify those ports with -p 80,443. This makes Nmap perform version detection exclusively on those two ports and ignore all others. Other port specifications would expand the scope: using a port 22 and 80 would include port 22 as well, not just 80 and 443; a range like 80-443 would cover many ports in between; and a range like 22-80 also spans multiple ports. So the command that targets only 80 and 443 with version detection is the one that uses -sV together with -p 80,443.

To check service versions on specific ports, combine version detection with a precise port list. The -sV option tells Nmap to probe services to determine their versions. To limit this to only ports 80 and 443, you specify those ports with -p 80,443. This makes Nmap perform version detection exclusively on those two ports and ignore all others.

Other port specifications would expand the scope: using a port 22 and 80 would include port 22 as well, not just 80 and 443; a range like 80-443 would cover many ports in between; and a range like 22-80 also spans multiple ports. So the command that targets only 80 and 443 with version detection is the one that uses -sV together with -p 80,443.