5.1. MINIMUM IMPLEMENTATION

In order to make FTP workable without needless error messages, the following minimum implementation is required for all servers:

         TYPE - ASCII Non-print
         MODE - Stream
         STRUCTURE - File, Record
         COMMANDS - USER, QUIT, PORT,
                    TYPE, MODE, STRU,
                      for the default values
                    RETR, STOR,
                    NOOP.

The default values for transfer parameters are:

         TYPE - ASCII Non-print
         MODE - Stream
         STRU - File

All hosts must accept the above as the standard defaults.