The OSI (Open Systems Interconnection) Model is a conceptual model that characterises and standardises the communication functions of a. The OSI Model As mentioned in the previous section, the need for The OSI model states the purpose of each layer and describes the services provided . This repository aims at implementing all the layers of OSI model using a file transfer application. Flow control simulation of Data Link Layer in OSI Layer.
Each header can be understood only by the corresponding layer at the receiving side.
OSI Model Tutorial
At the receiving side, corresponding header is stripped off in the same layer it was attached. Understand each layer Layer 7 — Application layer This is the closest layer to the end user.
It provides the interface between the applications we use and the underlying layers.
But notice that the programs you are using like a web browser — IE, Firefox or Opera… do not belong to Application layer. Layer 6 — Presentation layer This layer ensures the presentation of data, that the communications passing through are in the appropriate form for the recipient. In general, it acts as a translator of the network.
For example, you want to send an email and the Presentation will format your data into email format. Layer 5 — Session layer Layer 5 establishes, maintains and ends communication with the receiving device. Layer 4 — Transport layer This layer maintains flow control of data and provides for error checking and recovery of data between the devices. Layer 3 — Network layer This layer provides logical addresses which routers will use to determine the path to the destination.
Layer 2 — Data Link Layer The Data Link layer formats the message into a data frame, and adds a header containing the hardware destination and source address to it.
This header is responsible for finding the next destination device on a local network. It is the Layer 2 that helps data to reach the next destination.
This layer is subdivide into 2 sub-layers: The LLC functions include: MAC address is a 48 bits address which is burned into the NIC card on the device by its manufacturer. Layer 1 — Physical layer The Physical Layer defines the physical characteristics of the network such as connections, voltage levels and timing.
To help you remember the functions of each layer more easily, I created a fun story in which Henry English wants to send a document to Charles French to demonstrate how the OSI model works.
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