OSI Model By Amjad, Rimsha Safi Ullah And Iqra

OSI MODELGROUP 04

OSI Model By

Group 04

Group No. 4Hafiz

M.Amjad

Rimsha Riaz

Safi Ullah Nasir

Fahad Hashir

Iqra Parveeen

RIMSHA RIAZ

ISO International Standard OrganizationEstablished In 1947Open System Interconnection Model Understanding And Designing A

Network Architecture 

INTRODUCTION

Allow Different Types Of Network To Communicate

Avoidable Duplication Of Equipment Resources

Breaks Network Communication Into Smaller Parts

To Facilitates Standardization Of Network Components

NEED OF OSI

7. Application

6. Presentation

5. Session

4. Transport

3. Network

2. Data Link

1. Physical

LAYERS OF OSI

Upper Layers

Lower Layers

Middle Layer

7. Application

6. Presentation

5. Session

4. Transport

3. Network

2. Data Link

1. Physical

DIVISION OF LAYERS

SAFI ULLAH NASIR

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

PHYSICAL LAYER

PurposeTranslation Of Bits Into Signals

Example• Transmission Synchronization

PHYSICAL LAYER

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

DATA LINK LAYER

Purpose• Manages The Flow Of Data Over The Physical Media

Responsible For Error-Free Transmission

DATA LINK LAYER

IQRA PARVEEN

Optimal Path. Data Is In The Form Of Packets Logical (IP) Addressing Routing Main Protocols At This Layer

Are IP ,ICMP ,ARP Logical addressing.

NETWORK LAYER

Purpose• Addressing And Routing The Packets

Example Application At The Router• If The Packet Size Is Large, Splits Into Small Packets

NETWORK LAYER

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

TRANSPORT LAYER

Purpose• Repackage Proper And Efficient Delivery of packagesError freeIn sequenceWithout Duplication

TRANSPORT LAYER

FAHAD HASHIR

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

SESSION LAYER

Translation.Encryption.Compression.Compatibility With OS.Proper Encapsulation Of Data For Network Transmission.

Data Formatting ( ASCII, Binary)

PRESENTATION LAYER

Purpose• Formats Data For Exchange Between Points Of CommunicationEx: Between Nodes In A Network

Example:• Redirector Software• Formats For Transmission To The Server

PRESENTATION LAYER

HAFIZ M. AMJAD

User Use DataFile Transfer, Access, And Management.

Mail Services.Directory Services.

APPLICATION LAYER

Purpose• The application layer is responsible for providing services to the user.

Examples• File Request From Server• E-mail Services

APPLICATION LAYER

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.  

SUMMARY

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.

SUMMARY

SummaryThe 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).