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Networking The Open System Interconnection (OSI) Reference Model was developed in 1984 by the International Organization for Standardization (ISO). The OSI Reference Model is a description of how information flows through a network from one system to another system (“Introduction”). It was created to allow communication between computer systems from multiple vendors (Norton 10). The OSI model divides the processes needed for this communication into seven layers. The layers are Application Layer, Presentation Layer, Session Layer, Transport Layer, Network Layer, Data Link Layer, and Physical Layer. The top layer in the OSI model is Layer 7 or the Application Layer. Of the seven layers, the Application Layer is located closest to the user. User applications are not included in this layer (Norton 14). The Application Layer acts as an interface between the user applications and the services of the network (Norton 14). It identifies the communication partners, identifies the quality of service, takes into consideration privacy and user authentication, and identifies constraints on data syntax. Telnet, File Transfer Protocol (FTP), and Simple Mail Transfer Protocol (SMTP) are all included in the Application Layer. Layer 6 or the Presentation Layer is the next layer in the OSI model. It is sometimes referred as the syntax layer.
Approximate Word count = 800
Approximate Pages = 3.2
(250 words per page double spaced)
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