1. The data link layer Skills: none IT concepts: LAN, medium access, Ethernet and WiFi protocols, why standards win 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. 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,

4. The view from 2,000 feet

5. Networks inside the cloud The router at the edge of each network

6. The LANs and the Internet Data link layer Data link layer Internet layer

7. A simple LAN combining data link (Ethernet and WiFi) and internet (IP) protocols in one box

8. A complex LAN may have many switches and routers

9. Data link layer protocols Ethernet (copper and optical fiber) WiFi (physical and data link)

10. 101011010101 010101101010 111010101011 Transfer data and check for errors

11. Medium access control

12. WiFi and Ethernet won because they were Open Dynamic (WiFi was also license free)

13. The data link layer Skills: none IT concepts: LAN, medium access, Ethernet and WiFi protocols, why standards win This work is licensed under a Creative Commons Attribution-Noncommercial- Share Alike 3.0 License.