1/15 Chapter 5 Open Systems Interconnection Model.

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Presentation transcript:

1/15 Chapter 5 Open Systems Interconnection Model

2/15 OSI MODEL The International Standards Organization (ISO) is a multinational body dedicated to worldwide agreement on international standards, established in The Open Systems Interconnection (OSI) modelisan ISO standard that covers all aspects of network communications, it was first introduced in the late 1970s. The International Standards Organization (ISO) is a multinational body dedicated to worldwide agreement on international standards, established in The Open Systems Interconnection (OSI) model is an ISO standard that covers all aspects of network communications, it was first introduced in the late 1970s. Layered Architecture Peer-to-Peer Processes Encapsulation Topics discussed in this section:

3/15 Seven layers of the OSI model

4/15 The interaction between layers in the OSI model

5/15 An exchange using the OSI model

6/15 Physical layer The physical layer is responsible for movements of individual bits from one hop (node) to the next.

7/15 Data link layer The data link layer is responsible for moving frames from one hop (node) to the next.

8/15 Hop-to-hop delivery

9/15 Network layer The network layer is responsible for the delivery of individual packets from the source host to the destination host.

10/15 Source-to-destination delivery

11/15 Transport layer The transport layer is responsible for the delivery of a message from one process to another.

12/15 Reliable process-to-process delivery of a message

13/15 Session layer The session layer is responsible for dialog control and synchronization.

14/15 Presentation layer The presentation layer is responsible for translation, compression, and encryption.

15/15 Application layer The application layer is responsible for providing services to the user.