"What's on your network and how vulnerable is it to a hacker
attack? Having a clear picture of this is a vital part of effective
network administration, and one way to build up such a picture is
by network mapping using a port scanner.
"Port scanning is the art of sending packets onto the network
and analyzing what comes back--and what doesn't. By sending packets
to specific ports and IP addresses it's possible to build up a
picture of the IP addresses of devices that are connected, what
OSes they are running, what ports they have open, and the services
running on those ports. (Of course there are other ways of doing
this, but since port mapping is one of the first types of
reconnaissance a hacker is likely to perform, doing your own port
mapping will give you a clear idea of what hackers may find
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