04-08-2012, 02:25 PM
OSI MODEL
osi layer presentation.ppt (Size: 432 KB / Downloads: 30)
OSI REFERENCE MODEL
Open systems interconnection(OSI) is a standard reference model for communication b/w two end users in a network
FEATURES OF THE OSI MODEL
The osi model is not a protocols ,it is a model for under standing and designing a n/w architecture that is flexible ,robust
OSI layer consist of seven layer in
In two group
The Physical Layer
Responsibility:
transmission of raw bits over a communication channel.
Issues:
mechanical and electrical interfaces
time per bit
distances
The Network Layer
Responsibilities:
Routing of data across the network from one end to another .
subnet flow control.
fragmentation & reassembly
translation between different network types.
Issues:
Data in to packet
virtual circuits
Function of transport layer
Fragments and reassembles of data and handles error handling
Proper sequencing and and with loss of duplication
Take action to correct faulty transmission
Control flow of data