Using these two communication connections, two distinct modes of operation determine in which direction the connections are established: Active mode and Passive mode.įTP is a TCP based service exclusively. Once the Control connection has been used to exchange information on which file is required, the Data connection is used to transfer the file between the client and server. This is effectively the mechanism that enables the user to tell the server which file is being requested, which directory it is in, and so forth.ĭata connection: The second TCP-based connection is used for the actual transfer of user data. FTP differs from HTTP (Hyper Text Transfer Protocol, used for serving websites via web browsers) fundamentally as it is an application made up of two distinct TCP connections:Ĭontrol connection: This TCP-based connection is used to provide a communications channel for the delivery of commands and replies. ![]() ![]() ![]() FTP exists primarily for the transfer of data between two end points.
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