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Computer Networks

Computer Networks. Marwan Al- Namari Week 4. 7 Layers. OSI Layer Communication. Application. Application. Presentation. Presentation. Physical Path. Session. Session. Logical Path. Transport. Transport. Network. Network. Data Link. Physical. Data Link. Physical Medium.

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Computer Networks

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  1. Computer Networks Marwan Al-Namari Week 4

  2. 7 Layers

  3. OSI Layer Communication

  4. Application Application Presentation Presentation Physical Path Session Session Logical Path Transport Transport Network Network Data Link Physical Data Link Physical Medium Physical OSI 7-Layer Model logical view

  5. The interaction between layers in the OSI model

  6. Encapsulation Each layer add its own header (and maybe trailer ) to the portion of the packet and pass it to the next layer without knowing which part is data and header( and maybe trailer ).it treat it as one integral unit. The concept is called encapsulation. In the way back each layer will take-off the header ( and maybe trailer ) from the incoming packet and pass it to the next layer . The concept is called decapsulation.

  7. Packet Components

  8. The Complete Packet Cyclical Redundancy Check

  9. Packet Creation Process

  10. OSI vs. TCP/IP Model

  11. TCP/IP standards The Internet Engineering Task Force (IETF) is the body that defines standard internet operating protocols These standards are specified in documents called RFCs ( Requests for comments) e.g. RFC 821 is about SMTP ( e-mail) protocols

  12. TCP/IP TCP/IP : Transmission Control Protocol /Internet Protocol. It is a suite of protocols providing communications in a heterogeneous environment. It is used for interoperability among many different types of computers. Almost all networks support TCP/IP. Support routing. Used as internetworking protocol.

  13. Other Protocols in the Suite These protocols were written specifically for TCP/IP: SMTP(Simple Mail Transfer Protocol) : Email FTP (File Transfer Protocol) : For exchanging files . SNMP(Simple Network Management Protocol) :Network Management.

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