OSI model in computer networking.

1. Sirifort Institute of Management Studies
OSI Model
Submitted To: Submitted By:
Mr. Vijay Yadav (Asstt.Prof. BCA Dept.)
Prachi Arora
(BCA 2nd Year, Evening)
(02224302017,40324302017)

3.  International Standard Organization(ISO) established a
committee in 1947 to develop an architecture for
systems communication
 Open System Interconnection(OSI) reference model is
the result of this effort.
 This model allows any two different systems to
communicate regardless of their underlying architecture.

4.  The OSI model describes how data flows from one
computer, through a network to another computer.
 The OSI model is not a protocol; it is a model for
understanding and designing a network architecture that
is flexible and robust.
 The OSI model consists of seven separate but related
layers, each of which defines a part of the process of
moving information across a network.

6.  Physical layer is the bottom(layer 1) of OSI Model.
 It is responsible for the actual physical connection
between the devices.
 This Layer is responsible for the movements of individual
bits from one node to next.

8.  Convert bits to signals
 Bit Synchronization
 Bit Rate control
 Line configuration
 Physical topology
 Transmission mode

9. The data link layer is responsible for moving
frames from one node to the next.

10.  Framing
 Physical Addressing
 Flow Control
 Error Control

12.  It is responsible for the source to destination delivery
of a packets across multiple networks.
 Routing
 Logical Addressing

13.  It is responsible for the source process to destination
process delivery of entire message.
Two types of
Transport layers
Connection
Oriented
Transmission
Connectionless
Transmission

15.  Segmentation and Reassembly
 Service point addressing
 Error Control
 Flow Control

16. Session Layer...
It is responsible for beginning, maintaining and ending the
communication between two devices

17.  Establishment, maintaining and ending session
 Dialog Control
 Synchronization

18. Presentation Layer...
This layer is concerned with the syntax and semantics of the
information exchanged between two systems.

19. Functions of
Presentation layer
Data
Translation
Data
Encryption
Data
Compression

20.  Provides User Interfaces and support for services like e-
mail, file transfer.

21. Functions of Application
Layer
Network Virtual
Terminal
File Transfer
Access and
Management
Mail Services
Directory
Services