Home > Operating System > Computer Network Management > OSI Reference Model

Open System Interconnection (OSI) Reference Model

ISO-OSI reference model is an example of network architecture. This model is based on a proposal developed by the International Standards Organization (ISO) as a first step towards international standardization of the protocols used in the various layers. This model is called the ISO OSI (Open system Inter connection) Reference Model because to deals with connecting open systems – that is, systems that are open for communication with other systems. It is referred just as OSI model for short. The OSI model consist of 7 layers.

1. Physical layer
2. Data link layer
3. Network layer
4. Transport layer
5. Session layer
6. Presentation layer
7. Application layer

Each layer is defined for having associated with distinct functions. The functions performed by each layer can be described as below :

Physical layer

This layer defines the electrical and mechanical aspects of interfacing to a physical medium for transmitting data. It also defines how physical links are setup, maintained and disconnected.

Data link layer

This layer establishes an error free communication path between computers over the physical channel. It gives the standard for framing messages, checking integrity of messages received, accessing and using channels and sequencing of transmitted data.

Network layer

This layer determines the setting up of a logical path between computers in a network, message addressing to computers and controlling message flow between computer modes.

Transport layer

Once a path is established between computers it provides control standards for a communication session for enabling possesses to exchange data reliably and sequentially, independent of which systems are communicating or their location in the network.

Presentation layer

This layer provides facilities to convert encoded transmitted data into forms which can be displayed on a video terminal or printed.

Application layer

This layer provides services that directly support user such as file transfer, remove file access, data base management etc.,

More Information
Laptop Parts
Laptop OS
Booting Process
OS Installation
Motherboard
Computer Performance
Multiprocessing
Computer Bus
Hard Disk
Floppy Disk
Compact Disc
Keyboard
Hardware Drivers
BIOS
Mouse
PC Remote Control Softwares
Project Management
Shopping Cart
Thin Client Software

Related Information
RAID Controller
DLT Tape Drive
Data Backup Software
Financial Planning
Business Process Management