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Open Systems Interconnection (OSI)

Open Systems Interconnection (OSI). Supplemental Material. Internetworking. Open Systems Interconnection (OSI). Developed by the International Organization for Standardization (ISO) in 1984 The primary architectural model for intercomputer communications.

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Open Systems Interconnection (OSI)

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  1. Open Systems Interconnection (OSI) Supplemental Material

  2. Internetworking

  3. Open Systems Interconnection (OSI) • Developed by the International Organization for Standardization (ISO) in 1984 • The primary architectural model for intercomputer communications. • A conceptual model composed of seven layers, each specifying particular network functions. • Describes how information from a software application in one computer moves through a network medium to a software application in another computer.

  4. OSI Model F-D’s Model Internet Model OSI Model Application layer: http, telnet, snmp, smtp, nfs, ftp Application layer TCP, UDP Network layer IPv4, IPv6 Data Link layer Data Link Layer (HDLC) Physical layer Physical layer

  5. OSI Model • Network layer • provides routing and related functions • Transport layer • implements reliable internetwork data transport services • Session layer • establishes, manages and terminates communication sessions between presentation layer entities • Presentation layer • provides a variety of coding and conversion functions • Application layer • closest to the end user

  6. Protocols • Protocols fall into one of the following groups: • LAN protocols • WAN protocols • Network protocols • Routing protocols

  7. Interaction between Layers A data link layer contact three other layers

  8. Headers and Data

  9. Physical-layer Implementation

  10. OSI Data Link Layer IEEE has subdivided data link layer into two sub-layers.

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