1. TCP/IP summary Skills: none IT concepts: review This work is licensed under a Creative Commons Attribution-Noncommercial- Share Alike 3.0 License.

2. Internet concepts –Applications –Technology (communication) –Implications for Internet skills –Application development –Content creation Where does this topic fit?

3. The application layer Application Program, for example, a Web client Application Program, for Example, a Web server A TCP/IP network

4. The transport layer, TCP and UDP A C B → A B C Which port (application program)?

5. The Internet layer, IP

6. The data link layer, Ethernet and WiFi Data link layer Data link layer Internet layer

7. or The physical layer, media and modulation

8. TCP/IP protocol layers from 2,000 feet up LayerFunction ApplicationDo useful work like Web browsing, email, and file transfer Four Lower layers Handle communication between the client and server

9. TCP/IP protocol layers from 1,000 feet up Application Transport Internet Data link Physical Programs that do useful work like retrieve Web pages, copy files, send and receive email, etc. Make client-server connections and optionally control transmission speed, check for errors, etc. Route data between networks Route data within the local area network Specify what medium connects two nodes, how binary ones and zeros are differentiated, etc,

10. TCP/IP protocols Application Transport Internet Data link Physical Many -- HTTP, FTP, POP, SMTP, etc. TCP and UDP IP Ethernet and WiFi Many – fiber, copper, wireless

11. TCP/IP summary Skills: none IT concepts: review This work is licensed under a Creative Commons Attribution-Noncommercial- Share Alike 3.0 License.