Trivial File Transfer Protocol (TFTP)
The Trivial File Transfer Protocol (TFTP) is used to transfer files between the TFTP client and a TFTP server, a computer running the tftpd TFTP daemon. This protocol uses UDP as a transport and, unlike FTP, does not require a user to log on to transfer files. Because TFTP does not require a user logon, it is often considered a security hole, especially if the TFTP server permits writing.
The TFTP protocol was designed to be small so that both it and the UDP protocol could be implemented on a PROM (Programmable Read Only Memory) chip. The TFTP protocol is limited (hence the name trivial) when compared to the FTP protocol. The TFTP protocol can only read and write files; it cannot list the contents of directories, ...
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