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The TCP/IP communication layer stack Skills: none IT concepts: protocol layers, TCP/IP, OSI This work is licensed under a Creative Commons Attribution-NoncommercialShare Alike 3.0 License. Where does this topic fit? • Internet concepts – Applications – Technology (communication) – Implications • 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, TCP/IP from 2,000 feet up Application Program, for example, a Web client A TCP/IP network Application Program, for Example, a Web server TCP/IP protocol layers from 2,000 feet up Layer Function Application Do useful work like Web browsing, email, and file transfer Four Lower layers Handle communication between the client and server Terminology confusion pitfalls • Some authors combine the data link and physical layers as the “network access” or the “network interface” layer. • Different authors use different layer names like “network layer” instead of “internet layer.” OSI versus TCP/IP OSI (open systems interconnection) was historically significant derived by a different process and lost in the marketplace. The TCP/IP communication layer stack Skills: none IT concepts: protocol layers, TCP/IP, OSI This work is licensed under a Creative Commons Attribution-NoncommercialShare Alike 3.0 License. A few questions Do you recall the names of the TCP/IP protocol layers? 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, Do you recall the functions of the software at each layer? Application Transport Internet Data link Physical
