Seven Network Layers

Open System Interconnection, model defines a networking framework for applying methods in seven layers. Control is passed in one layer to another, beginning in the application layer in a single station, proceeding towards the bottom layer, within the funnel to another station and support the hierarchy.

The OSI, or Open System Interconnection, model defines a networking framework for applying methods in seven network layers. Control is passed in one layer to another, beginning in the application layer in a single station, and proceeding towards the bottom layer, within the funnel to another station and support the hierarchy. Here's 7 networking layers :


Application (Layer 7)

This layer supports application and finish-user processes. Communication partners are recognized, service quality is recognized, user authentication and privacy are thought, and then any constraints on data syntax are recognized. Everything only at that layer is application-specific. This layer provides application services for file transfers, e-mail, along with other network software services. Telnet and FTP are programs which exist entirely within the application level. Tiered application architectures are thing about this layer.

Presentation (Layer 6)

This layer provides independence from variations in data representation (e.g., file encryption) by converting from application to network format, and the other way around. The presentation layer activly works to transform data in to the form the application layer can accept. This layer formats and encrypts data to become sent across a network, supplying freedom from compatibility problems. Frequently it's known as the syntax layer.

Session (Layer 5)

This layer determines, handles and terminates connections between programs. The session layer creates, coordinates, and terminates conversations, trades, and dialogues between your programs each and every finish. It handles session and connection coordination.

Transport (Layer 4)

This layer provides transparent transfer of information between finish systems, or hosts, and accounts for finish-to-finish error recovery and flow control. It guarantees complete data.

Network (Layer 3)

This layer provides switching and routing technologies, creating logical pathways, referred to as virtual circuits, for transmitting data from node to node. Routing and sending are functions of the layer, in addition to addressing, internetworking, error handling, congestion control and packet sequencing.

Data Link (Layer 2)

Only at that layer, data packets are encoded and decoded into bits. It provides transmission protocol understanding and management and handles errors within the physical layer, flow control and frame synchronization. The information link layer is split into two sub layers: The Media Access Control (MAC) layer and also the Logical Link Control (LLC) layer. The MAC sub layer controls the way a computer about the network gains use of the information and permission to deliver it. The LLC layer controls frame synchronization, flow control and error checking.

Physical (Layer 1)

This layer conveys the part stream - electrical impulse, light or radio signal -- with the network in the electrical and mechanical level. It offers the hardware way of delivering and receiving data on the company, including determining cables, cards and physical aspects. Fast Ethernet, RS232, and ATM are methods with physical layer components.

Thats all seven layer model