Lecture TCP-IP protocol suite - Chapter 21: Trivial File Transfer Protocol (TFTP)

Transferring files from one computer to another is one of the most common tasks expected from a networking or internetworking environment. As a matter of fact, the greatest volume of data exchange in the Internet today is due to file transfer. In this chapter, we discuss two protocols involved in transferring files: File Transfer Protocol (FTP) and Trivial File Transfer Protocol (TFTP).
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Lecture TCP-IP protocol suite - Chapter 21: Trivial File Transfer Protocol (TFTP) Chapter21 TrivialFile TransferProtocol (TFTP)McGrawHill ©TheMcGrawHillCompanies,Inc.,2000 CONTENTS •MESSAGES •CONNECTION •DATATRANSFER •UDPPORTS •TFTPEXAMPLE •TFTPOPTIONS •SECURITY •APPLICATIONSMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000 TFTP uses the services of UDP on the well-known port 69.McGrawHill ©TheMcGrawHillCompanies,Inc.,2000 21.1 MESSAGESMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure211 Message categoriesMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure212 RRQ Read request Mode: netascii or octetMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure213 WRQ Write requestMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure214 DATA formatMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure215 ACK formatMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure216 ERROR formatMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000 21.2 CONNECTIONMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure217 Connection establishmentMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000 21.3 DATA TRANSFERMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure218 Sorcerer’s apprentice bugMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000 21.4 UDP PORTSMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure219 UDP port numbers used by TFTPMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000 21.5 TFTP EXAMPLEMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000Figure2110 TFTP exampleMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000 21.6 TFTP OPTIONSMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000 21.7 SECURITYMcGrawHill ©TheMcGrawHillCompanies,Inc.,2000