Functions of OSI Layers Seven Layers in OSI: Introduction to OSI, Layers in OSI and Importance of 7 Layers in OSI
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Functions of OSI Layers: Seven Layers in OSI (Computer Science)
Topics
- Introduction on OSI
- Seven layers of OSI
- Functions of OSI layers
- Name of unit exchanged in different layers
Introduction on OSI
- OSI stands for ‘Open System Interconnection’
- It was established in 1970 by ISO i.e..International Standards Organisation .
- It is an ‘open source’ structure which means that it can be openly used for any environment and network easily for communication purpose.
- It is a seven layered structured architecture.
Functions of Seven Layers of OSI
1) Physical Layer:
- Physical layer is responsible for movement of bits from one node to another.
- Hardware cabling, wireless or wireline, everything is defined here.
- Synchronization of bits is also concerned here.
2) Data Link Layer:
- It divides stream of bits received from network layer into units called frames.
- It is also responsible for:
- Flow control
- Error control
- Access control
- It is also responsible for physical addressing of frames.
3) Network Layer:
- It is responsible for source to destination delivery of a packets across various networks.
- It is also responsible for:
- Logical addressing
- Routing
- Switching
4) Transport Layer:
- It is responsible for:
- Segmentation with sequence numbers
- Reassembly of segments
- Connection control
- Flow control
- Error control
- Delivery of Message from one process to another
5) Session Layer:
- It is responsible for:
- Dialog Control
- Synchronization
6) Presentation Layer:
- It is responsible for:
- Translation (for encoding scheme)
- Encryption
- Compression
7) Application Layer:
- It is responsible for:
- File transfer
- Management
- Directory services
#OSI Layers
#Function of Physical Layer
#Function of Data Link Layer
#Function of Network Layer
#Function of Transport Layer
#Function of Session Layer
#Function of Presentation Layer
#Function of Application Layer
✍ Mayank