:)

2. By
Group 04

3. Group No. 4
Hafiz
M.Amjad
Rimsha
Riaz
Safi Ullah
Nasir
Fahad
Hashir
Iqra
Parveeen

5. ISO International Standard Organization
Established In 1947
Open System Interconnection Model
 Understanding And Designing A Network
Architecture

6.  Allow Different Types Of Network To
Communicate
Avoidable Duplication Of Equipment Resources
Breaks Network Communication Into Smaller
Parts
To Facilitates Standardization Of Network
Components

7. 7. Application
6. Presentation
5. Session
4. Transport
3. Network
2. Data Link
1. Physical

8. Upper Layers
Lower Layers
Middle Layer
7. Application
6. Presentation
5. Session
4. Transport
3. Network
2. Data Link
1. Physical

10. Representation Of Bits.
Physical Topology.
Data Rate.
Synchronization Of Bits.
Transmission Mode.
Hub

11. Purpose
 Translation Of Bits Into Signals
Example
• Transmission Synchronization

12. Framing.
Physical Addressing.
Flow Control.
Error Control.
Access Control.
Switch

13. Purpose
• Manages The Flow Of Data Over The
Physical Media
 Responsible For Error-Free
Transmission

15.  Optimal Path.
 Data Is In The Form Of Packets
 Logical (IP) Addressing
 Routing
 Main Protocols At This Layer Are IP
,ICMP ,ARP
 Logical addressing.

16. Purpose
• Addressing And Routing The Packets
Example Application At The Router
• If The Packet Size Is Large, Splits Into
Small Packets

17. Service-Point Addressing.
Segmentation And Reassembly.
Connection Control.
Flow Control.
Error Control.

18. Purpose
• Repackage Proper And Efficient
Delivery of packages
 Error free
 In sequence
 Without Duplication

20. Dialog control.
Synchronization.
Purpose
• Oversee A Communication Session
• Establish
• Maintain
• Terminate

21. Translation.
Encryption.
Compression.
 Compatibility With OS.
 Proper Encapsulation Of Data For
Network Transmission.
 Data Formatting ( ASCII, Binary)

22. Purpose
• Formats Data For Exchange Between
Points Of Communication
 Ex: Between Nodes In A Network
Example:
• Redirector Software
• Formats For Transmission To The
Server

24. User Use Data
File Transfer, Access, And Management.
Mail Services.
Directory Services.

25. Purpose
• The application layer is responsible for
providing services to the user.
Examples
• File Request From Server
• E-mail Services

26. The International Standards Organization
 Open Systems Interconnection
 Allows Diverse Systems To Communicate.
Provides Guidelines.
The Physical Layer:Transmit A Bit.
The Data Link Layer:Deliveres Data Units.
The Network Layer:Source-To-Destination Delivery
Of Packet.

27. The Transport Layer : Process-To-Process
Delivery Message.
The Session Layer: Synchronizes.
The Presentation Layer : The presentation
layer is responsible for translation,
compression, and encryption.
The Application Layer:Provides User Interface
And Support For Services.

28. Summary
 The International Standards Organization created a model called the Open
Systems Interconnection, which allows diverse systems to communicate.
 The seven-layer OSI model provides guidelines for the development of
universally compatible networking protocols.
 The physical layer coordinates the functions required to transmit a bit
stream over a physical medium.
 The data link layer is responsible for delivering data units from one station to
the next without errors.
 The network layer is responsible for the source-to-destination delivery of a
packet across multiple network links.
 The transport layer is responsible for the process-to-process delivery of the
entire message.
 The session layer establishes, maintains, and synchronizes the interactions
between communicating devices.
 The presentation layer ensures interoperability between communicating
devices through transformation of data into a mutually agreed upon format.
 The Application Layer Enable user, (human or software) to access the
network and Provides user interface and support for services (email, Remote
file access, shared database management system).