Nmap's default port scanning covers how many ports?

Nmap's default port scanning covers how many ports?

• A. 100 ports
• B. 65,535 ports
• C. 1,000 ports
• D. 500 ports

Answer: (C)

Nmap’s default port range targets the 1000 most commonly used TCP ports. This selection focuses on the services you’re most likely to encounter, giving a practical balance between speed and the chance of finding open ports. If you need to scan every possible port, you would specify a full range like 1-65535 (using -p- or -p 1-65535). If you want a quicker, smaller sweep, you can use fast mode to cover around the top hundred ports (-F). So, the default covers 1,000 ports because that’s the built-in, standard set Nmap uses by default to optimize discovery without overwhelming the scan time.

Nmap’s default port range targets the 1000 most commonly used TCP ports. This selection focuses on the services you’re most likely to encounter, giving a practical balance between speed and the chance of finding open ports. If you need to scan every possible port, you would specify a full range like 1-65535 (using -p- or -p 1-65535). If you want a quicker, smaller sweep, you can use fast mode to cover around the top hundred ports (-F). So, the default covers 1,000 ports because that’s the built-in, standard set Nmap uses by default to optimize discovery without overwhelming the scan time.