OSI Model:
OSI means Open
System Interconnection (Interface) or symply OSI model.
This is a standard
is followed by every network device used in computmng.
Application Layer:
It is a interface
between the end user & Application and the Network.
It deals with the
software applications the is a user interface.
Presentation layer:
It negotiates data
exchange format. It deals with representing the data for
eg: jpg, doc, etc.
Session Layer:
it allows the user
to establish, manage and terminate the connection.
It handles the
actual connection between the system and also perfoems the name
resolvtion
Transport Layer:
it provides end to
end reliable connection. It gives the gearentee of data delivery.
If a packet fails to
reach the destination it notifies the sender, requesting another
packet to the sender
Network Layer:
it routes the data
through the larger internetwork. It defiens logical host address such
as IP address it
gives the
information about how & where the data should be defined
Data link Layer:
It determines access
tot he netwokr media and specfies How the data bits are grouped into
frames
it is divided into
two sublayers
Physical Layer:
All physical
equipment falls under this catogery, ie cables, NIC cards,
Data is transferred
through signals.
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