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Which port status type indicates a port is accessible and an application is listening?
Open
Closed
Unfiltered
Filtered
Port States NMAP will categorize ports as being in one of the following states: Open – The port is accepting TCP connections and UDP packets. This means that an application is running that is using this port. Closed – The port responds to NMAP probe requests but no application is using this port Filtered – The port state cannot be determined because packet filters prevent NMAP probes from reaching the port Unfiltered – The port is accessible but NMAP cannot determine if it is open or closed Open | Filtered – NMAP cannot determine if the port is open or filtered Closed | Filtered – NMAP cannot determine if the port is closed or filtered https://www.petri.com/port-scanning-with-nmap
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