Which syntax scans ports that are in the nmap-services list below a threshold?

• A. -p 1-1024
• B. -p [1024]
• C. -p [-1024]
• D. -p 0-1024

Answer: (C)

Understanding port range notation in Nmap helps you target ports by numeric criteria. The question asks for the syntax that scans ports in the nmap-services list that are below a certain threshold. In this context, the form that signals “less than” a value is used. Using a dash before the threshold within brackets communicates that you want all ports below that limit, so -p [-1024] selects ports strictly under 1024. The other options describe ranges that end at 1024, start at 0, or span a consecutive block up to 1024, which don’t express the “below” condition as cleanly.