In a .net domain, « net » is the abbreviation of « Network », namely « network » in French. The name is due to the fact that only the internet service providers originally used the TLD. This extension is meant to reflect the intended usage, in this case the web addresses of network operators and internet service providers. Today, .net domains are not only among the oldest domain extensions that were already implemented in the early days of the Internet, but also among the most popular.

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Ubuntu FTP server: How to configure it?
An Ubuntu FTP server allows both downloading and sending files, each access being controlled by a separate connection. In this tutorial on the Ubuntu FTP