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Nmap scan and port states
Revision card: Nmap scan and port states. Easy English, with a real example. Scan the QR for the full lesson.
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What this card says
| State | Means |
|---|---|
| open | a service is listening |
| closed | nothing there |
| filtered | a firewall blocks it |
In one line
Nmap shows a port as open (a service answers), closed (nothing), or filtered (a firewall blocks it).
Note
Example: nmap -sS on your own lab host to list open ports.
Learn more in the lesson: 19.6 Nmap Basics: Host Discovery, Port States and Scan Types