Which option filters results to show only ports that are open (or possibly open)?

Which option filters results to show only ports that are open (or possibly open)?

• A. -n
• B. --open
• C. --traceroute
• D. -iL

Answer: (B)

Filtering by port state is what this tests. The option that makes Nmap show only ports whose state is open (or possibly open) is --open. Nmap reports each port as open, closed, filtered, or open|filtered, and this switch restricts the display to those ports that are open or potentially open, making reachable services stand out. Other switches don’t filter by port state: -n disables DNS resolution, --traceroute shows the hop path to the host, and -iL reads targets from a file. So the --open option is the one that narrows the results to open (or possibly open) ports.

Filtering by port state is what this tests. The option that makes Nmap show only ports whose state is open (or possibly open) is --open. Nmap reports each port as open, closed, filtered, or open|filtered, and this switch restricts the display to those ports that are open or potentially open, making reachable services stand out. Other switches don’t filter by port state: -n disables DNS resolution, --traceroute shows the hop path to the host, and -iL reads targets from a file. So the --open option is the one that narrows the results to open (or possibly open) ports.