Concetti Chiave
- The OSI model, developed by ISO in 1984, consists of 7 independent but interactive layers, enhancing modularity and allowing new protocols and network services.
- Layer 7 (Application) identifies communication patterns and service quality, providing network services like file transfers.
- Layer 6 (Presentation) encrypts and formats data for compatibility, ensuring smooth interaction with the Application layer.
- Layer 5 (Session) manages connections between applications, while Layer 4 (Transport) handles data translation and error recovery.
- Layer 3 (Network) oversees switching, routing, and logical data transmission, managing error handling and packet sequencing.
The OSI or Open System Interconnection was developed in 1984 by the ISO. It rapresent an abstract model and it is made up od 7 layers; thanks to its modularity each layers is independent but, at the same time, it can interact with the others and it offering same advantages: new protocols and network serverices can be added.
Details on Higher Levels
Layer 7, or Application, communication partens and the quality of services are identificied. Moreover, application service for example file transports and other network services are provided. Layer 6, or Presentation, encrypts and formats data so that they can be accepted by layer 7 preventing compatibily problems. Layer 5, or Session, manages connections between applications. Layer 4, or Transport, translate date between hosts which are Pcs directly connected to the network. Moreover, it is also responsible for error recovery. Layer 3, or Network, manages switching and routing technologies by creating logical parts to trasmitted data from node to node; it handles error and packet sequencing.
Description of Lower Levels
Layer 2, or Data Link, endecoded and decoded data packet into bits. It is divided into 2 sublayers: MAC which controls how a computers gets access to the data and trasmitted it; and LLC whhich handles packet syncronization flow control, and error checking. Layer 1, or physical, conveys the bit stream throw the Network providing the hardware means to send and receive data.
Domande da interrogazione
- What is the primary purpose of the OSI model developed by the ISO in 1984?
- What roles do the lower layers of the OSI model play in data transmission?
The OSI model serves as an abstract framework consisting of 7 layers, each independent yet capable of interacting with others. This modularity allows for the addition of new protocols and network services.
The lower layers, such as the Data Link and Physical layers, handle data encoding, access control, synchronization, error checking, and the physical transmission of the bit stream across the network.
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