The data link layer Skills none IT concepts

The data link layer Skills: none IT concepts: LAN, medium access, Ethernet and Wi. Fi protocols, why standards win This work is licensed under a Creative Commons Attribution-Noncommercial. Share Alike 3. 0 License.

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

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

The view from 2, 000 feet

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

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

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

A complex LAN may have many switches and routers

Data link layer protocols Ethernet (copper and optical fiber) Wi. Fi (physical and data link)

Transfer data and check for errors 101011010101101010 111010101011

Medium access control

Wi. Fi and Ethernet won because they were Open Dynamic (Wi. Fi was also license free)

The data link layer Skills: none IT concepts: LAN, medium access, Ethernet and Wi. Fi protocols, why standards win This work is licensed under a Creative Commons Attribution-Noncommercial. Share Alike 3. 0 License.