Open System Interconnection Model / OSI :
This model allows communications between two systems with
different architecture.
Composition of OSI
It consists of seven layers.
These are as follows:
1.
Physical Layer
2.
Data Link Layer
3.
Network Layer
5.
Session Layer
6.
Presentation Layer
7.
Application Layer
Physical Layer
This is the bottom layer of OSI Model.
It also defines the characteristics and type of
transmission medium.
It also defines the type of encoding
It determines the data rate or number of bits that should be
sent per second.
Data Link Layer
This layer divides stream of bits into small easily handled
units called frames.
It ensures system to control rate of transmission of data
such that there remains a balance between rate of receiving and transmission of
data.
It also detects damaged frames and prevents duplication of frames.
Network Layer:
This layer manages the establishment,maintenance and termination
of network layers.
It determines a path between sender and the receiver and
manages the delivery of data from source to destination.
Transport Layer:
This layer is responsible for ensuring efficient data
transmission takes place between the sender and the recipient.
It eliminates errors in the messages and divides larger data
packets into smaller ones for efficiency in data transmission.
Session layer:
This layer pertains with users management.
It helps in establishing,managing and terminating
connections between users.
Presentation Layer
This layer plays a role in changing data and formatting it such
that it canbe transmitted between the sender and recipient effectively.
It can also compress a large sized data into smaller size a
process called compression.
Application Layer:
This layer provide services to the users such as
emails,network sharing etc.
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