OSI Assignment Help

OSI Assignment Help OSI Assignment Help

model is called open system Interconnection (OSI) and is usually referred as the OSI reference model . The OSI model has seven layers. These range from the lowest layer , where the physical and electrical connection to the network is made, up to the highest  level , where  the actual user of the data that has been passed resides.

The seven layers in the ISO model-

Level 7 (highest)             Application

Level 6                           Presentation

Level 5                           Session

Level 4                           Transport

Level 3                           Network

Level 1                           Physical

Not all applications need or use all seven layers for a successful, practical working system. The lowest three layers are enough for many applications.  Let’s study the definition of each layer and its role.

Roles of each layer —


LayerPrimary functionsServices provided to next layer
7ApplicationSupport  the end user, LOGIN, password, file transferThis is the highest layer and provides user oriented services
6PresentationCode and format conversionFreedom from compatibility problems.
5SessionSession management, synchronizationDialogue management
4TransportOptimum utilization of the network resourcesEnd-to-end transport connection of the required quality in a cost- effective manner
3NetworkInteraction with the subnetwork; Routing and relayingNetwork connection linking the end systems
2Data linkError control; Flow controlReliable transfer of bits across the physical connection
1PhysicalConversion of bits into electrical signals of suitable characteristics and

Transmission of bits

The physical Layer-

 The physical layer is concerned with transmitting raw bits over a communication channel.

The Data link

The main task of the link layer is to take a raw transmission facility and transform it into a line that appears free of undetected transmission errors to the network layer.

The Network Layer-

The network layer, acts to route the communications through the various communication resources to the other end

The Transport Layer-

 The basic function of the transport layer is to accept data from the session layer, split it up into smaller units if need be,

The Session Layer-

The session Layer must manage and synchronize conversations between two different applications. Session can allow traffic to go in both direction at the same time, or in only one direction at a time.

The presentation Layer-

Makes sure that the information is delivered in a form that the receiving system can understand and use.


The Application Layer-

The top of the model is the application layer, layer 7, which provides for the manipulation of information in various ways.

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