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Open Systems Interconnection (OSI)

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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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