osi model ppt

7/16/2019 osi model ppt

http://slidepdf.com/reader/full/osi-model-ppt-5634f76a297ec 1/17

PRESENTED TO: COMPOSED BY:

MR. RAVI SIR SHILPA SHARMA

EC 3 R D YEAR

ROLL NO:10

OSI MODELS



OSI ( Open System Interconnection)

OSI model is developed by International

Standards Organization(ISO) in 1982.

The OSI model is a concept that describes how data communication should take place in thenetwork.

OSI is a reference model because it’s purpose is to

guide product implementers so that their product will consistently work with other product.



OSI ( Open System Interconnection)

All network, based on a theoretical model called theOSI model.

Its divides network into seven layer. Some protocols are used at each layer.



Types of layer :-

7. application layer

6. presentation layer

5. Session layer 4. transport layer

3. network layer

2. data link layer

1. physical layer



OSI Model’s Data Transformation

Scheme



1. Physical Layer

The physical layer provides the electrical andmechanical interface to the network media.

It’s ability to transport a stream of serial data bits

between two communicating system. Data transferred in form of bits.

Physical layer consists of simply the hardware, wire, sockets, signal generator etc.



2.Data Link Layer

Data link layer transfers data between physical layerand network layer.

This layer grouped bits inform of frame.

It’s primary function is to prevent data corruption within the physical layer.

Data link layer divided in to two parts

1. Logical Link Control (LLC)

2. Medium Access control (MAC)



3.Network Layer

Network layer forms individual packets from datasupplied by the data link layer.

Network layer routes the data in right direction toright destination on out going transmission andreceiving incoming transmission at the packetlevel.

Network layer also handle network traffic.

It deliver packets from a node on network toanother node.



4.Transport Layer

•It is responsible for constructing stream of datapackets ,sending and checking for correct delivery .

• This layer manage end to end control and errorchecking .

• It ensures complete data transfer

•

The transport layer ensures data is successfullysend and received between two end nodes.



5.SESSION LAYER

• Session layer negotiates connection betweenapplication on different host computers.

• This layer transform data packaged fornetwork transmission into application data.

•Its determine one way or two waycommunication and manage between both

parties.



6.Presentation Layer

• Presentation layer is usually part of operatingsystem .

•This layer defines how the system providesfiles and services in a uniform way toapplication.

•

Presentation layer convert incoming andoutgoing data from one presentation format



7. Application Layer

• Application layer providesnetwork services directly to theuser application

• This layer is said to be closest tothe users.

• This layer provide interfacebetween software running in acomputer and the network



REFRENCES

http://www.tech-faq.com en.wikipedia.org/wiki/ OSI _model



Thank You for your Attention



Questions

osi model ppt

Documents