PP Presentation

• TFTP takes (with comments and command line processing) 2000 lines of C code.
• The max sequence number is
• , where n=length of the ack field in the frame. For TFTP packets, an ACK takes 4 bytes. Two bytes for the op-code, two bytes for the sequence number. Data blocks may be 512 bytes long.
• TFTP will run out of sequence numbers after
• bytes are sent without ack.
• Stop-and-wait uses n=1 so that sequence number are 0 and 1.
• A one Bit Sliding Window Protocol. This is stop-and-wait since the sender transmits a frame and waits for its ack. Protocal 4 withstands errors and timeouts

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