A port scanner is a software application designed to probe a server or host for open ports. This is often used by administrators to verifysecurity policies of their networks and by attackers to identify running services on a host with the view to compromise it.
A port scan or portscan is "An attack that sends client requests to a range of server port addresses on a host, with the goal of finding an active port and exploiting a known vulnerability of that service.
Later on we will discuess some most common port scanners.
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