The "port scanning" is a practice often associated with illegal activities or otherwise carry out attacks aimed at security of a computer. Although this is undeniably one of the possible applications, there are many scenarios in which the entirely legitimate technique can be valuable
Throughout this article we will try to understand "bird's eye" of what it is, and we'll see how to do a port scan using some free tools real.
Every program you want to communicate over a network is called to open a specific communications port. Wanting to trivialize a speech rather complex, one can imagine that from that port to pass all data directed to the application in question.
A web server such as the famous Apache HTTP Server, for example, prepares to receive data on port number 80 "type" TCP immediately after it starts: this means that every client program (the web browser, in this case) will be , called to connect to TCP port 80 of the remote server, and, through this, request the page to be shown on the video and all other elements.
See Pictures and Read more : Port scanning for everyone: a practical guide to Nmap and ShieldsUP
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