The OSI Model and Its Organization and Functions

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Module 1 Written Assignment: The OSI Model
Presented to Thomas Edison State College

In Partial Fulfillment of the Requirements
For the Bachelor of Science in Applied Science & Technology
Information Technology

Network Technology
Course Number: CMP-354 OL009

David Regan

Mentor: Sam Adhikari

This paper discusses the Open System Interconnection reference model (OSI model) and the organization and function of its 7 layers. The OSI model is the most commonly referenced networking communication model, but it is rarely implemented in its entirety Ciccarelli et al. (2008). The OSI model provides a common frame of reference for discussing various hardware and software issues (Ciccarelli et al., 2008). The layers are the: Application, Presentation, Session, Transport, Network, Data Link and Physical (Ciccarelli et al., 2008). When data is sent, the user application sends data down through the layers of the model, which are self contained and have specific functions. Each layer adds information to the data pertaining to the layer’s control. The OSI model was created in 1984 by the International Standards Organization (ISO) in response to the need for a set of standards to allow computers to communicate through a network according to Ciccarelli et al. (2008). Additional rationales for the OSI model are given and most significant among them is that it was designed to overcome interoperability issues with networking products from disparate vendors (Ciccarelli et al., 2008; Davis, 2008). Other reasons given for creating the OSI model include: • to clarify general functions of internetworking (Rivard & Roherty, 2008) • to divide the complexity of networking into smaller more manageable bites (Rivard & Roherty, 2008) • to simplify troubleshooting (Ciccarelli et al., 2008) • to allow developers to change and improve components of a networking stack without altering the function of other...
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