One of the first network protocols ever developed was the File Transfer Protocol (FTP). It is used to share files, which is indeed one of the most obvious advantages of a shared network. As one of the oldest protocols, FTP is relatively simple.
There are two different ways in which the FTP can work, based on how it handles its connections. FTP uses two different connections: the control connection and the data connection. The control connection is the first to be established and uses the port 21 by default. The data connection is established every time a listing or transfer is requested, ...
