THE OSI MODEL
Open Systems Interconnection model
Established in 1947,
by the International Standards Organization (ISO)
It...
Layers of OSI Model

Application

7

Presentation

6

Session

5

Transport

4

Network

3

Data Link

2

Physical

1
Each layer in the a stream of bits to device B (through intermediate it receives
Device A sends sending device adds its ow...
Classification of Layers
Application
Presentation
Session
Transport
Network
Data Link
Physical

7
6
5
4
3
2
1

The Network...
7

Application

6

Presentation

5

Session

4

Transport

3

Network

2

Data Link

1

Physical

Software

Hardware + Sof...
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Osi model

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Osi model

  1. 1. THE OSI MODEL Open Systems Interconnection model Established in 1947, by the International Standards Organization (ISO) It is layered framework for the design of network systems It consists of seven separate but related layers Each Layer defines the process of moving information across a network
  2. 2. Layers of OSI Model Application 7 Presentation 6 Session 5 Transport 4 Network 3 Data Link 2 Physical 1
  3. 3. Each layer in the a stream of bits to device B (through intermediate it receives Device A sends sending device adds its own information to the message nodes). from the Within a above it and passes the wholecalls upon the layer just below it. layer just single machine, each layer package to the services of the layer just below it. A Application Message Application Message Presentation Session Presentation Message Session Message Transport Network Transmission Media Message Data Link Network Data Link Physical B Message 01100100 Physical Message Message Message Message C Transport Network Data Link Physical
  4. 4. Classification of Layers Application Presentation Session Transport Network Data Link Physical 7 6 5 4 3 2 1 The Network Support Layers These Layers dealt with the physical The transport can befrom the two as These layers layer, thought of aspects of moving data links one device subgroups and ensures that what the user support to another such as- layers; they allow the lower layers have transmitted interoperability among unrelated Electrical is in a form•that the specifications software systems upper layers can use. • Physical connections • Physical addressing • Transport timing • Reliability). Transport Layer User Support Layers
  5. 5. 7 Application 6 Presentation 5 Session 4 Transport 3 Network 2 Data Link 1 Physical Software Hardware + Software Hardware only

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