OSI Model <br />By<br />SyedMunawer Hassan<br />
Introduction<br />ISO International Standard Organization Established in 1947 Multinational body dedicated to worldwide ag...
The Model<br />Layered framework Designed for communication across all types of computer system 7 separate but related lay...
Why we need OSI Model<br />To allow different types of network hardware and software to communicate with each other<br />A...
1. Physical Layer<br />Physical characteristics of interfaces and medium.<br />Representation of bits.<br />Physical topol...
2. Data Link Layer<br />Framing.<br />Physical addressing.<br />Flow control.<br />Error control.<br />Access control.<br />
3. Network Layer<br />Logical addressing.<br />Routing.<br />
4. Transport Layer<br />Service-point addressing.<br />Segmentation and reassembly.<br />Connection control.<br />Flow con...
5. Session Layer<br />Dialog control.<br />Synchronization.<br />
6. Presentation Layer<br />Translation.<br />Encryption.<br />Compression.<br />
7. Application Layer<br />Network virtual terminal.<br />File transfer, access, and management.<br />Mail services.<br />D...
Summary<br />The International Standards Organization created a model called the Open Systems Interconnection, which allow...
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Osi Model

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Osi Model

  1. 1. OSI Model <br />By<br />SyedMunawer Hassan<br />
  2. 2. Introduction<br />ISO International Standard Organization Established in 1947 Multinational body dedicated to worldwide agreement Standard of international level Covers all aspects of network communications <br />It is Open System Interconnection MODELAllow two different Machines to connect without change in hardware and softwareIt is model for understanding and designing a network architecture <br />
  3. 3. The Model<br />Layered framework Designed for communication across all types of computer system 7 separate but related layer Each defines segment of process of moving information across network.<br />
  4. 4. Why we need OSI Model<br />To allow different types of network hardware and software to communicate with each other<br />Avoidable duplication of equipment resources<br />To breaks network communication into smaller, simpler parts that are easy to develop<br />To facilitates standardization of network components to allow multiple – vendor development and support<br />
  5. 5. 1. Physical Layer<br />Physical characteristics of interfaces and medium.<br />Representation of bits.<br />Physical topology.<br />Line configuration.<br />Data rate.<br />Synchronization of bits.<br />Transmission mode.<br />
  6. 6. 2. Data Link Layer<br />Framing.<br />Physical addressing.<br />Flow control.<br />Error control.<br />Access control.<br />
  7. 7. 3. Network Layer<br />Logical addressing.<br />Routing.<br />
  8. 8. 4. Transport Layer<br />Service-point addressing.<br />Segmentation and reassembly.<br />Connection control.<br />Flow control.<br />Error control.<br />
  9. 9. 5. Session Layer<br />Dialog control.<br />Synchronization.<br />
  10. 10. 6. Presentation Layer<br />Translation.<br />Encryption.<br />Compression.<br />
  11. 11. 7. Application Layer<br />Network virtual terminal.<br />File transfer, access, and management.<br />Mail services.<br />Directory services.<br />
  12. 12. Summary<br />The International Standards Organization created a model called the Open Systems Interconnection, which allows diverse systems to communicate. <br />The seven-layer OSI model provides guidelines for the development of universally compatible networking protocols. <br />The physical layer coordinates the functions required to transmit a bit stream over a physical medium. <br />The data link layer is responsible for delivering data units from one station to the next without errors. <br />The network layer is responsible for the source-to-destination delivery of a packet across multiple network links. <br />The transport layer is responsible for the process-to-process delivery of the entire message. <br />The session layer establishes, maintains, and synchronizes the interactions between communicating devices. <br />The presentation layer ensures interoperability between communicating devices through transformation of data into a mutually agreed upon format. <br />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).<br />
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