ITET1 Routing Application layer.odp

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Transcript

  • 1. Application layer
  • 2. OSI model
    • Application layer
    • 3. Actually covers
  • 6. Application achitechture Peer-to-peer Client/server
  • 7. Application layer protocols
  • 12. HTTP
    • You know this one
      • Client/Server or P2P?
      • 13. TCP or UDP?
    • A standard
      • RFC 1945 and 2616
  • 14. HTTP questions
    • What is the relationship between HTTP and HTML?
    • 15. What is GET and POST?
    • 16. Default port number for HTTP?
  • 17. HTTP response message Other possibilities:
    • 404 not found
    • 18. 400 Bad request
    • 19. 301 Moved permanently
    • 20. And more. See RFCs for details.
  • 21. Exercise
    • Telnet or hyperterminal to a HTTP server
      • Ex. www.sde.dk
      • Why HTTP stuff?
      • 24. Why host?
  • 25. Possible solution Send Received
  • 26. Web proxy
    • Caches data
      • Reduces bandwidth usage, increases responsiveness
      • 27. Uses “If-modified-since” header line
  • 28. Homework
    • Install wireshark
    • 29. Redo the HTTP exercise, both using a browser and telnet.
      • What do you see in wireshark?
  • 30. SMTP example
    • Connect and send an email using telnet.
  • 31. DNS
  • 32. DNS root servers Root server geographically
  • 33. Dns exercise
    • dig dr.dk
    • 34. dig dr.dk MX
    • 35. dig google.com
    • 36. dig @dns101.telia.com google.com
    • 37. And how does this look in wireshark?