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S kills : none

TCP/IP from 10,000 feet. S kills : none C oncepts : l ocal area network, router, inter network, the TCP/IP layered software “stack”, layer functions, layer protocols, dumb versus smart networks.

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S kills : none

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  1. TCP/IP from 10,000 feet Skills: none Concepts: local area network, router, inter network, the TCP/IP layered software “stack”, layer functions, layer protocols, dumb versus smart networks This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License.

  2. Where does this topic fit? • Internet concepts • Applications • Technology • Implications • Internet skills • Application development • Content creation • User skills

  3. TCP/IP from the outside Application Program, for example, a Web client Application Program, for Example, a Web server A TCP/IP network

  4. Local area networks LAN LAN

  5. A router at the edge ? ? ?

  6. From LAN to Internet to LAN

  7. The Internet a network of networks

  8. The path between two hosts

  9. Crossing the LAN R LAN

  10. From the LAN to the ISP’s router

  11. Forward to next network

  12. Forward to next network

  13. Forward to next network

  14. Reaches the destination network

  15. Delivered by the data link layer Client Server

  16. A router goes down

  17. Net routes around problems

  18. TCP/IP, the very big picture

  19. Function of each layer

  20. Function of each layer

  21. Function of each layer

  22. Transport layer protocols TCP (transmission control protocol) or UDP (universal datagram protocol)

  23. Data link layer protocols Ethernet or Wifi Ethernet or Wifi

  24. Internet layer protocol IP (the internet protocol)

  25. Application layer protocols Different protocols for each application Different protocols for each application

  26. Physical layer standards or

  27. Protocols at each layer

  28. By design, the Internet is dumb The Internet The telephone network The telephone network is smart

  29. Summary

  30. Self-study questions Do you have a LAN at home? How many computers connect to it There is only one connection leading out from your home router – where does it forward packets to? When you connect to the Internet using a mobile device like a phone or a tablet, are you connecting to a network that is connected to the Internet? Explain. We saw that there were two commonly protocols at the transport layer – TCP for reliable communication and UDP for fast, but unreliable communication. Which would an application programmer use for a file-transfer program? Which would an application programmer use for a streaming video program? Explain your answers.

  31. Do you recall the names of the TCP/IP protocol layers?

  32. Do you recall the functions of the software at each layer? Application: Transport: Internet: Data link: Physical:

  33. Do you recall the protocol(s) used at each layer? Application: Transport: Internet: Data link: Physical:

  34. Resources

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