What you mean by OSI Model? Functions of each layer in the OSI model?
OSI Model and functions of each layer.
OSI model is a way of describing how different applications and protocols interact on network-aware devices.
Functions of each Layer:
Physical Layer(Layer 1):This layer defines the physical and electrical characteristics of the network. Helps to pass strings(data) of ones and zeros down the wire.
Device:Hub, NIC, Repeater.. etc
Data Link Layer:
It defines the acess strategy for sharing the physical medium. Helps convert the bits into frame.
Devices: Bridge, Switch
Layer 3 is the Network Layer, providing a means for communicating open systems to establish, maintain and terminate network connections.
It provides two communicating presentation entities to exchange data with eachother.
The main function of Session Layer is to ensure data reliability and integrity.
Application data is either unpacked or packed only in this layer. Protocol conversions, encryption/decryption and graphics expansion all takes place here.
This is where you find your end-user and end-application protocols, such as telnet, ftp, and mail(pop3 and smtp).
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