OSI model does not specify the protocols required to be used to perform networking tasks but is a model for understanding and designing a network architecture.
The Seven layers of OSI model are as follows :
1. Physical Layer : It is the lowest layer of the OSI model.It co-ordinates the functions required to transmit a bit stream over a communication channel.
Functions of Physical layer:
-Physical characteristics of interface and media.
-Representation of bits.
-Data rate.
-Synchronization of bits.
2. Data link layer : This layer is responsible for transmitting frames from one node to another.
Functions :
-Framing.
-Physical Addressing.
-Flow control.
-Error control.
-Access control.
3. Network Layer : This layer is responsible for delivery of packets from source host to destination host.
Functions :
-Logical Addressing.
-Routing.
4. Transport Layer : This layer is responsible for delivery of messages from one process to another.
Functions:
-Port addressing.
-Segmentation and reassembly.
-Flow control.
-Error control.
-Connection control.
5. Session Layer : This layer is responsible for dialog control and Synchronization.
Functions:
-Dialog Control.
-Synchronization.
6. Presentation Layer : This layer deals with the syntax and semantics of the information being exchanged.
Functions :
-Translation.
-Encryption.
-Compression.
7. Application Layer : This layer is responsible for accessing the network by the user.
Functions :
-Network virtual terminal.
-Mail services.
-Directory services.
-File transfer,Access and management(FTAM).
These are the different layers present in the OSI Model and their associated functions.
Thank you for reading.
Vishwesh Wali from India.
