![]() ![]() ACK: It is the response from the receiving side against acquiring a block of the file to the sender.DATA: These are the TFTP DATA messages that contain blocks of a file to be sent over the server.WRQ: It is the request made by the TFTP client to transfer or send a file over the server.RRQ: It is the request made by the TFTP client to read or fetch a file from the server.The TFTP usually has five different types of messages, as given below. Hence, this is the way TFTP achieves flow control. ![]() And if not, again, the first block of the file is sent. If for the sent block, an acknowledgment is received within the block timer, then the second block of the file is sent. At first, when the sender sends the first block, it starts a preset block timer. Since the TFTP follows check and pause protocol, it sends each block one by one in succession.
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