Ch21

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Ch21

  1. 1. Chapter 21 Trivial File Transfer Protocol (TFTP)
  2. 2. CONTENTS <ul><li>MESSAGES </li></ul><ul><li>CONNECTION </li></ul><ul><li>DATA TRANSFER </li></ul><ul><li>UDP PORTS </li></ul><ul><li>TFTP EXAMPLE </li></ul><ul><li>TFTP OPTIONS </li></ul><ul><li>SECURITY </li></ul><ul><li>APPLICATIONS </li></ul>
  3. 3. TFTP uses the services of UDP on the well-known port 69.
  4. 4. MESSAGES 21.1
  5. 5. Figure 21-1 Message categories
  6. 6. Figure 21-2 RRQ Read request Mode: netascii or octet
  7. 7. Figure 21-3 WRQ Write request
  8. 8. Figure 21-4 DATA format
  9. 9. Figure 21-5 ACK format
  10. 10. Figure 21-6 ERROR format
  11. 11. CONNECTION 21.2
  12. 12. Figure 21-7 Connection establishment
  13. 13. DATA TRANSFER 21.3
  14. 14. Figure 21-8 Sorcerer’s apprentice bug
  15. 15. UDP PORTS 21.4
  16. 16. Figure 21-9 UDP port numbers used by TFTP
  17. 17. 21.5 TFTP EXAMPLE
  18. 18. Figure 21-10 TFTP example
  19. 19. TFTP OPTIONS 21.6
  20. 20. SECURITY 21.7
  21. 21. Figure 21-11 TELNET with FTP for security
  22. 22. 21.8 APPLICATIONS
  23. 23. Figure 21-12 Use of TFTP with BOOTP

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