This document presents information on the OSI model for computer networking. It was presented by Anindya Nag and Rohit Sharma, third year B-Tech CSE students. There are two main models for data communication: the OSI model and the TCP/IP suite. The OSI model was developed by ISO and consists of 7 layers - physical, data link, network, transport, session, presentation, and application layer. The physical and data link layers are hardware layers, while the top three layers are software layers. The transport layer is called the heart of the OSI model. The OSI model follows a layered architecture to transmit data from sender to receiver through intermediate devices.

1. COMPUTER NETWORK
ECS43105

2. OSI MODEl
(OPEN SYSTSM
INTERCONNECTION
MODEL):

3. Presented By:
•ANINDYA NAG &
• Rohit Sharma
•Roll No : UG/02/BTCSE/2018/005
•& Roll No: UG/02/BTCSE/2018/009
•B-Tech CSE , Section – “B” [3rd yr , 5th sem]

4. •There are mainly 2 types of model for data
communication
1. OSI Model
2. TCP/IP Suit

5. OSI MODEL:
•OSI Model Developed by ISO(
International Standard Organization)
•OSI model is a Seven layer
Architecture.
•OSI Model is the global Accepted
model because Heterogeneous
networks

6. 7 LAYERS IN OSI MODEL:
•1.Physical Layer (Layer 1)
•2.Data Link Layer (Layer 2)
•3. Network Layer (Layer 3)
•4.Transport Layer (Layer 4)
•5.Session Layer (Layer 5)
•6.Presentation Layer (Layer 6)
•7.Application Layer (Layer 7)

7. Application Layer (Layer 7), Presentation Layer (Layer
6), Session Layer (Layer 5)
are software layer..
Transport Layer (Layer 4) is called heart of OSI model
• Network Layer (Layer 3), Data Link Layer (Layer 2),
Physical Layer (Layer 1) are Hardware layer..
OIS mode follows a layered architecture for transmission
of data from sender to receiver through INTERMEDIATE
Devices.

11. •OIS mode follows a layered
architecture for transmission of data
from sender to receiver through
INTERMEDIATE Devices.

12. FUNCTION OF PHYSICAL LAYER (LAYER 1)
• Bit Synchronization
• Bit Rate control
• Data transmission as bit over a medium
• It create physical link Between sender and Receiver

13. FUNCTION OF DATA LINK LAYER (LAYER 2)
•Main function of this layer are flow
control & error control.
•Access Control
•Physical Addressing
•Framing
•It organize bits into frames.

14. FUNCTION OF NETWORK LAYER (LAYER 3)
• Inter networking
• Packetizing
• Logical Addressing
• Routing
• It is responsible for moving the packet from source to
the destination,

15. FUNCTION OF TRANSPORT LAYER
• Service point Addressing
• Reliable message deliver from process to process
• reassembly

16. FUNCTION OF SESSION LAYER
•Synchronization
•Dialog Contriller
•Maintence and
•Termination

17. FUNCTION OF PRESENTATION LAYER
•Translation
•Compression
•Mainly Encryption
•Dectryption

18. FUNCTION OF APPLICATION LAYER
•Derectly Connection to sendr and receiver
•Access to network resources
•Provide services to the user

24. DATA LINK
LAYER:
The data link layer is responsible for moving frames from
one node to the next.

25. PHYSICAL
LAYER :

26. THANK YOU